Guide for pathologists dealing with gynaecological tissue which may have been exposed to Esmya (Ulipristal acetate)
- 1. Name of the medicinal product
- 2. Qualitative and quantitative composition
- 3. Pharmaceutical form
- 4. Clinical particulars
- 4.1 Therapeutic indications
- 4.2 Posology and method of administration
- 4.3 Contraindications
- 4.4 Special warnings and precautions for use
- 4.5 Interaction with other medicinal products and other forms of interaction
- 4.6 Fertility, pregnancy and lactation
- 4.7 Effects on ability to drive and use machines
- 4.8 Undesirable effects
- 4.9 Overdose
- 5. Pharmacological properties
- 5.1 Pharmacodynamic properties
- 5.2 Pharmacokinetic properties
- 5.3 Preclinical safety data
- 6. Pharmaceutical particulars
- 6.1 List of excipients
- 6.2 Incompatibilities
- 6.3 Shelf life
- 6.4 Special precautions for storage
- 6.5 Nature and contents of container
- 6.6 Special precautions for disposal and other handling
- 7. Marketing authorisation holder
- 8. Marketing authorisation number(s)
- 9. Date of first authorisation/renewal of the authorisation
- 10. Date of revision of the text
PosologyThe treatment consists of one tablet of 5 mg to be taken orally once daily for treatment courses of up to 3 months each.Treatments should only be initiated when menstruation has occurred:- The first treatment course should start during the first week of menstruation.- Re-treatment courses should start at the earliest during the first week of the second menstruation following the previous treatment course completion.The treating physician should explain to the patient the requirement for treatment free intervals.Repeated intermittent treatment has been studied up to 4 intermittent courses.If a patient misses a dose, the patient should take ulipristal acetate as soon as possible. If the dose was missed by more than 12 hours, the patient should not take the missed dose and simply resume the usual dosing schedule.
Renal impairmentNo dose adjustment is recommended in patients with mild or moderate renal impairment. In the absence of specific studies, ulipristal acetate is not recommended in patients with severe renal impairment unless the patient is closely monitored (see sections 4.4 and 5.2).
Hepatic impairmentNo dose adjustment is recommended for patients with mild hepatic impairment. In the absence of specific studies, ulipristal acetate is not recommended in patients with moderate or severe hepatic impairment unless the patient is closely monitored (see sections 4.4 and 5.2).
Paediatric populationThere is no relevant use of ulipristal acetate in the paediatric population. The safety and efficacy of ulipristal acetate was only established in women of 18 years and older.
Method of administrationTablets may be taken with or without food.
ContraceptionConcomitant use of progestagen-only pills, a progestagen-releasing intrauterine device or combined oral contraceptive pills is not recommended (see sections 4.5). Although a majority of women taking a therapeutic dose of ulipristal acetate have anovulation, a non hormonal contraceptive method is recommended during treatment.
Endometrial changesUlipristal acetate has a specific pharmacodynamic action on the endometrium:Changes in the histology of the endometrium may be observed in patients treated with ulipristal acetate. These changes are reversible after treatment cessation.These histological changes are denoted as Progesterone Receptor Modulator Associated Endometrial Changes (PAEC) and should not be mistaken for endometrial hyperplasia (see sections 4.8 and 5.1).In addition, reversible increase of the endometrium thickness may occur under treatment.In case of repeated intermittent treatment, periodic monitoring of the endometrium is recommended. This includes annual ultrasound to be performed after resumption of menstruation during off-treatment period.If endometrial thickening is noted, which persists after return of menstruations during off-treatment periods or beyond 3 months following the end of treatment courses, and/or an altered bleeding pattern is noted (see 'bleeding pattern'), investigation including endometrial biopsy should be performed in order to exclude other underlying conditions, including endometrial malignancy.In case of hyperplasia (without atypia), monitoring as per usual clinical practice (e.g. a follow-up control 3 months later) would be recommended. In case of atypical hyperplasia, investigation and management as per usual clinical practice should be performed.The treatment courses should each not exceed 3 months as the risk of adverse impact on the endometrium is unknown if treatment is continued without interruption.
Bleeding patternPatients should be informed that treatment with ulipristal acetate usually leads to a significant reduction in menstrual blood loss or amenorrhea within the first 10 days of treatment. Should the excessive bleeding persist, patients should notify their physician. Menstrual periods generally return within 4 weeks after the end of each treatment course.If, during repeated intermittent treatment, after the initial reduction in bleeding or amenorrhea, an altered persistent or unexpected bleeding pattern occurs, such as inter-menstrual bleeding, investigation of the endometrium including endometrial biopsy should be performed in order to exclude other underlying conditions, including endometrial malignancy.Repeated intermittent treatment has been studied up to 4 intermittent treatment courses.
Renal impairmentRenal impairment is not expected to significantly alter the elimination of ulipristal acetate. In the absence of specific studies, ulipristal acetate is not recommended for patients with severe renal impairment unless the patient is closely monitored (see section 4.2).
Hepatic impairmentThere is no therapeutic experience with ulipristal acetate in patients with hepatic impairment. Hepatic impairment is expected to alter the elimination of ulipristal acetate, resulting in increased exposure (see section 5.2). This is considered not to be clinically relevant for patients with mildly impaired liver function. Ulipristal acetate is not recommended for use in patients with moderate or severe hepatic impairement unless the patient is closely monitored (see section 4.2).
Concomitant treatmentsCo-administration of moderate (e.g. erythromycin, grapefruit juice, verapamil) or potent (e.g. ketoconazole, ritonavir, nefazodone, itraconazole, telithromycin, clarithromycin) CYP3A4 inhibitors and ulipristal acetate is not recommended (see section 4.5).Concomitant use of ulipristal acetate and potent CYP3A4 inducers (e.g. rifampicin, rifabutin, carbamazepine, oxcarbazepine, phenytoin, fosphenytoin, phenobarbital, primidone, St John´s wort, efavirenz, nevirapine, long term use of ritonavir) is not recommended (see section 4.5).
Asthma patientsUse in women with severe asthma insufficiently controlled by oral glucocorticoids is not recommended.
Potential for other medicinal products to affect ulipristal acetate:
Hormonal contraceptivesUlipristal acetate has a steroid structure and acts as a selective progesterone receptor modulator with predominantly inhibitory effects on the progesterone receptor. Thus hormonal contraceptives and progestagens are likely to reduce ulipristal acetate efficacy by competitive action on the progesterone receptor. Therefore concomitant administration of medicinal products containing progestagen is not recommended (see section 4.4 and 4.6).
CYP3A4 inhibitorsFollowing administration of the moderate CYP3A4 inhibitor erythromycin propionate (500 mg twice daily for 9 days) to healthy female volunteers, Cmax and AUC of ulipristal acetate increased 1.2 and 2.9 fold, respectively; the AUC of the active metabolite of ulipristal acetate increased 1.5 fold while the Cmax of the active metabolite decreased (0.52 fold change).Following administration of the potent CYP3A4 inhibitor ketoconazole (400 mg once daily for 7 days) to healthy female volunteers, Cmax and AUC of ulipristal acetate increased 2 and 5.9 fold, respectively; the AUC of the active metabolite of ulipristal acetate increased 2.4 fold while the Cmax of the active metabolite decreased (0.53 fold change).No dose adjustment is considered necessary for administration of ulipristal acetate to patients receiving concomitant mild CYP3A4 inhibitors. Co-administration of moderate or potent CYP3A4 inhibitors and ulipristal acetate is not recommended (see section 4.4).
CYP3A4 inducersAdministration of the potent CYP3A4 inducer rifampicin (300 mg twice daily for 9 days) to healthy female volunteers markedly decreased Cmax and AUC of ulipristal acetate and its active metabolite by 90% or more and decreased ulipristal acetate half-life by 2.2-fold corresponding to an approximately 10-fold decrease of ulipristal acetate exposure. Concomitant use of ulipristal acetate and potent CYP3A4 inducers (e.g. rifampicin, rifabutin, carbamazepine, oxcarbazepine, phenytoin, fosphenytoin, phenobarbital, primidone, St John´s wort, efavirenz, nevirapine, long term use of ritonavir) is not recommended (see section 4.4).
Medicinal products affecting gastric pHAdministration of ulipristal acetate (10 mg tablet) together with the proton pump inhibitor esomeprazole (20 mg daily for 6 days) resulted in approximately 65% lower mean Cmax, a delayed tmax (from a median of 0.75 hours to 1.0 hours) and 13% higher mean AUC. This effect of medicinal products that increase gastric pH is not expected to be of clinical relevance for daily administration of ulipristal acetate tablets.
Potential for ulipristal acetate to affect other medicinal products:
Hormonal contraceptivesUlipristal acetate may interfere with the action of hormonal contraceptive products (progestagen only, progestagen releasing devices or combined oral contraceptive pills) and progestagen administered for other reasons. Therefore concomitant administration of medicinal products containing progestagen is not recommended (see sections 4.4 and 4.6). Medicinal products containing progestagen should not be taken within 12 days after cessation of ulipristal acetate treatment.
P-gp substratesIn vitro data indicate that ulipristal acetate may be an inhibitor of P-gp at clinically relevant concentrations in the gastrointestinal wall during absorption.Simultaneous administration of ulipristal acetate and a P-gp substrate has not been studied and an interaction cannot be excluded. In vivo results show that ulipristal acetate (administered as a single 10 mg tablet) 1.5 hour before administration of the P-gP substrate fexofenadine (60 mg) has no clinically relevant effects on the pharmacokinetic of fexofenadine. It is therefore recommended that co-administration of ulipristal acetate and P-gp substrates (e.g. dabigatran etexilate, digoxin, fexofenadine) should be separated in time by at least 1.5 hours.
Contraception in femalesUlipristal acetate is likely to adversely interact with progestagen-only pills, progestagen-releasing devices or combined oral contraceptive pills, therefore, concomitant use is not recommended. Although a majority of women taking a therapeutic dose of ulipristal acetate have anovulation, a non hormonal contraceptive method is recommended during treatment (see sections 4.4 and 4.5).
PregnancyUlipristal acetate is contraindicated during pregnancy (see section 4.3).There are no or limited amount of data from the use of ulipristal acetate in pregnant women.Although no teratogenic potential was observed, animal data are insufficient with regard to reproduction toxicity (see section 5.3).
Breast-feedingAvailable toxicological data in animals have shown excretion of ulipristal acetate in milk (for details see section 5.3). Ulipristal acetate is excreted in human milk. The effect on newborn/infants has not been studied. A risk to the newborns/infants cannot be excluded. Ulipristal acetate is contraindicated during breast-feeding (see sections 4.3 and 5.2).
FertilityA majority of women taking a therapeutic dose of ulipristal acetate have anovulation, however, the level of fertility while taking multiple doses of ulipristal acetate has not been studied.
Summary of the safety profileThe safety of ulipristal acetate has been evaluated in 1,053 women with uterine fibroids treated with 5 mg or 10 mg ulipristal acetate during Phase III studies. The most common finding in clinical trials was amenorrhea (79.2%), which is considered as a desirable outcome for the patients (see section 4.4).The most frequent adverse reaction was hot flush. The vast majority of adverse reactions were mild and moderate (95.0%), did not lead to discontinuation of the medicinal product (98.0%) and resolved spontaneously.Among these 1,053 women, the safety of repeated intermittent treatment courses (each limited to 3 months) has been evaluated in 551 women with uterine fibroids treated with 5 or 10 mg ulipristal acetate in two phase III studies (including 446 women exposed to four intermittent treatment courses of whom 53 were exposed to eight intermittent treatment courses) and demonstrated a similar safety profile to that observed for one treatment course.
Tabulated list of adverse reactionsBased on pooled data from four phase III studies in patients with uterine fibroids treated for 3 months, the following adverse reactions have been reported. Adverse reactions listed below are classified according to frequency and system organ class. Within each frequency grouping, adverse reactions are presented in order of decreasing seriousness. Frequencies are defined as very common (≥1/10), common (≥1/100 to <1/10), uncommon (≥1/1,000 to <1/100), rare (≥1/10,000 to <1/1,000), very rare (<1/10,000) and not known (cannot be estimated from available data).
|System Organ Class||Adverse reactions during treatment course 1|
|Psychiatric disorders||Anxiety Emotional disorder|
|Nervous system disorders||Headache*||Dizziness|
|Ear and labyrinth disorders||Vertigo|
|Respiratory, thoracic and mediastinal disorders||Epistaxis|
|Gastrointestinal disorders||Abdominal pain Nausea||Dry mouth Constipation||Dyspepsia Flatulence|
|Skin and subcutaneous tissue disorders||Acne||Alopecia** Dry skin Hyperhidrosis|
|Musculoskeletal and connective tissue disorders||Musculoskeletal pain||Back pain|
|Renal and urinary disorders||Urinary incontinence|
|Reproductive system and breast disorders||Amenorrhea Endometrial thickening*||Hot flush* Pelvic pain Ovarian cyst* Breast tenderness/pain||Uterine haemorrhage* Metrorrhagia Genital discharge Breast discomfort||Ovarian cyst ruptured* Breast swelling|
|General disorders and administration site conditions||Fatigue||Oedema Asthenia|
|Investigations||Weight increased||Blood cholesterol increased Blood triglycerides increased|
Description of selected adverse reactions
Endometrial thickeningIn 10-15% of patients, thickening of the endometrium (> 16 mm by ultrasound or MRI at end of treatment) was observed with ulipristal acetate by the end of the first 3-month treatment course. In subsequent treatment courses, endometrial thickening was less frequently observed (4.9% and 3.5% of patients by the end of second and fourth treatment course, respectively). The endometrial thickening reverses when treatment is stopped and menstrual periods resume.In addition, reversible changes to the endometrium are denoted PAEC and are different from endometrial hyperplasia. If hysterectomy or endometrial biopsy specimens are sent for histology, then the pathologist should be informed that the patient has taken ulipristal acetate (see sections 4.4 and 5.1).
Hot flushHot flushes were reported by 8.1% of patients but the rates varied across trials. In the active comparator controlled study the rates were 24% (10.5% moderate or severe) for ulipristal acetate and 60.4% (39.6% moderate or severe) for leuprorelin-treated patients. In the placebo-controlled study, the rate of hot flushes was 1.0% for ulipristal acetate and 0% for placebo. In the first 3-month treament course of the two long term Phase III trials, the frequency was 5.3% and 5.8% for ulipristal acetate, respectively.
HeadacheMild or moderate severity headache was reported in 5.8% of patients.
Ovarian cystFunctional ovarian cysts were observed during and after treatment in 1.0% of patients and in most of the cases spontaneously disappeared within a few weeks.
Uterine haemorrhagePatients with heavy menstrual bleeding due to uterine fibroids are at risk of excessive bleeding, which may require surgical intervention. A few cases have been reported during ulipristal acetate treatment or within 2-3 months after ulipristal acetate treatment was stopped.
Reporting of suspected adverse reactionsReporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the MHRA Yellow Card Scheme (www.mhra.gov.uk/yellowcard).
EndometriumUlipristal acetate exerts a direct effect on the endometrium. When daily administration of a 5 mg dose is commenced during a menstrual cycle most subjects (including patients with myoma) will complete their first menstruation but will not menstruate again until after treatment is stopped. When ulipristal acetate treatment is stopped, menstrual cycles generally resume within 4 weeks.The direct action on the endometrium results in class-specific changes in histology termed PAEC. Typically, the histological appearance is an inactive and weakly proliferating epithelium associated with asymmetry of stromal and epithelial growth resulting in prominent cystically dilated glands with admixed oestrogen (mitotic) and progestin (secretory) epithelial effects. Such a pattern has been observed in approximately 60% of patients treated with ulipristal acetate for 3 months. These changes are reversible after treatment cessation. These changes should not be confused with endometrial hyperplasia.About 5% of patients of reproductive age experiencing heavy menstrual bleeding have an endometrial thickness of greater than 16 mm. In about 10-15% of patients treated with ulipristal acetate the endometrium may thicken (> 16 mm) during the first 3-month treatment course. In case of repeated treatment courses, endometrial thickening was less frequently observed (4.9% of patients after second treatment course and 3.5% after fourth treatment course). This thickening disappears after treatment is withdrawn and menstruation occurs. If endometrial thickness persists after return of menstruations during off-treatment periods or beyond 3 months following the end of treatment courses, it may need to be investigated as per usual clinical practice to exclude other underlying conditions.
FibroidsUlipristal acetate exerts a direct action on fibroids reducing their size through inhibition of cell proliferation and induction of apoptosis.
PituitaryA daily dose of ulipristal acetate 5 mg inhibits ovulation in the majority of patients as indicated by progesterone levels maintained at around 0.3 ng/ml.A daily dose of ulipristal acetate 5 mg partially suppresses FSH levels but serum oestradiol levels are maintained in the mid-follicular range in the majority of patients and are similar to levels in patients who received placebo.Ulipristal acetate does not affect serum levels of TSH, ACTH or prolactin.
Clinical efficacy and safetyPre-operative use:The efficacy of fixed doses of ulipristal acetate 5 mg and 10 mg once daily was evaluated in two Phase 3 randomised, double-blind, 13 week studies recruiting patients with very heavy menstrual bleeding associated with uterine fibroids. Study 1 was double-blind placebo controlled. Patients in this study were required to be anaemic at Study entry (Hb < 10.2 g/dl) and all patients were to receive oral iron 80 mg Fe++ in addition to study drug. Study 2 contained the active comparator, leuprorelin 3.75 mg given once per month by intramuscular injection. In Study 2, a double-dummy method was used to maintain the blind. In both studies menstrual blood loss was assessed using the Pictorial Bleeding Assessment Chart (PBAC). A PBAC >100 within the first 8 days of menses is considered to represent excessive menstrual blood loss.In study 1, a statistically significant difference was observed in reduction in menstrual blood loss in favour of the patients treated with ulipristal acetate compared to placebo (see Table 1 below), resulting in faster and more efficient correction of anaemia than iron alone. Likewise, patients treated with ulipristal acetate had a greater reduction in myoma size, as assessed by MRI.In study 2, the reduction in menstrual blood loss was comparable for the patients treated with ulipristal acetate and the gonadotrophin releasing hormone-agonist (leuprorelin). Most patients treated with ulipristal acetate stopped bleeding within the first week of treatment (amenorrhea).The size of the three largest myomas was assessed by ultrasound at the end of treatment (Week 13) and for another 25 weeks without treatment in patients who did not have hysterectomy or myomectomy performed. Myoma size reduction was generally maintained during this follow-up period in patients originally treated with ulipristal acetate but some re-growth occurred in patients treated with leuprorelin.Table 1: Results of primary and selected secondary efficacy assessments in Phase III studies
|Parameter||Study 1||Study 2|
|Placebo N = 48||Ulipristal acetate 5 mg/day N = 95||Ulipristal acetate 10 mg/day N = 94||Leuprorelin 3.75 mg/ month|
N = 93
|Ulipristal acetate 5 mg/day N = 93||Ulipristal acetate 10 mg/day N = 95|
|Menstrual bleedingMedian PBAC at baseline Median change at week 13||376 -59||386 -329||330 -326||297 -274||286 -268||271 -268|
|Patients in amenorrhea at week 13||3 (6.3%)||69 (73.4%)1||76 (81.7%)2||74 (80.4%)||70 (75.3%)||85 (89.5%)|
|Patients whose menstrual bleeding became normal (PBAC < 75) at week 13||9 (18.8%)||86 (91.5%)1||86 (92.5%)1||82 (89.1%)||84 (90.3%)||93 (97.9%)|
|Median change in myoma volume from baseline to week 13a||+3.0%||-21.2%3||-12.3%4||-53.5%||-35.6%||-42.1%|
Repeated intermittent use:The efficacy of repeated treatment courses fixed doses of ulipristal acetate 5 mg or 10 mg once daily was evaluated in two Phase 3 studies assessing up to 4 intermittent 3-month treatment courses in patients with heavy menstrual bleeding associated with uterine fibroids. Study 3 was on open-label study assessing ulipristal acetate 10 mg, where each of the 3-month treatment was followed by 10 days of double-blind treatment with progestin or placebo. Study 4 was a randomized, double-blind clinical study assessing ulipristal acetate 5 or 10 mg.Studies 3 and 4 showed efficacy in controlling uterine fibroid symptoms (e.g. uterine bleeding) and reducing fibroid size after 2 and 4 courses.In study 3, treatment efficacy has been shown over > 18 months of repeated intermittent treatment (4 courses of 10 mg once daily), 89.7% of patients were in amenorrhea at the end of the treatment course 4.In study 4, 61.9% and 72.7% of patients were in amenorrhea at the end of both treatment course 1 and 2 combined (5 mg dose and 10 mg dose, respectively, p=0.032); 48.7 % and 60.5 % were in amenorrhea at the end of all four treatment courses combined (5 mg dose and 10 mg dose, respectively, p=0.027). At the end of treatment course 4, 158 (69.6%) subjects and 164 (74.5%) subjects were assessed as being in amenorrhea, in the 5 mg dose and 10 mg dose respectively (p=0.290).Table 2: Results of primary and selected secondary efficacy assessments in long term Phase III studies
|Parameter||After treatment course 2(two times 3 months of treatment)||After treatment course 4(four times 3 months of treatment)|
|Study 3a||Study 4||Study 3||Study 4|
|Patients starting treatment course 2 or 4||10 mg/dayN=132||5 mg/dayN= 213||10 mg/dayN=207||10 mg/dayN=107||5 mg/dayN=178||10 mg/dayN=176|
|Patients in amenorrheab,c||N=131||N = 205||N = 197||N=107||N =227||N =220|
|116 (88.5%)||152 (74.1%)||162 (82.2%)||96 (89.7%)||158 (69.6%)||164 (74.5%)|
|Patients with controlled bleedingb,c, d||NA||N=199||N=191||NA||N= 202||N=192|
|175 (87.9%)||168 (88.0%)||148 (73.3%)||144 (75.0%)|
|Median change in myoma volume from baseline||-63.2%||-54.1%||-58.0%||-72.1%||-71.8%||-72.7%|
Endometrial findings:In all Phase III studies including repeated intermittent treatment studies, a total of 7 cases of hyperplasia were observed out of 789 patients with adequate biopsies (0.89%). The vast majority spontaneously reversed to normal endometrium after resumption of menstruation during the off-treatment period. The incidence of hyperplasia did not increase with repeated treatment courses, including data on 340 women who received up to 4 courses of ulipristal acetate 5 or 10 mg and limited data of 43 women who received up to 8 courses of ulipristal acetate 10 mg. The observed frequency is in line with control groups and prevalence reported in literature for symptomatic pre-menopausal women of this age group (mean of 40 years).The European Medicines Agency has waived the obligation to submit the results of studies with Esmya in all subsets of the paediatric population in leiomyoma of uterus (see section 4.2 for information on paediatric use).
AbsorptionFollowing oral administration of a single dose of 5 or 10 mg, ulipristal acetate is rapidly absorbed, with a Cmax of 23.5 ± 14.2 ng/ml and 50.0 ± 34.4 ng/ml occurring approximately 1 h after ingestion, and with an AUC0-∞ of 61.3 ± 31.7 ng.h/ml and 134.0 ± 83.8 ng.h/ml, respectively. Ulipristal acetate is rapidly transformed into a pharmacologically active metabolite with a Cmax of 9.0 ± 4.4 ng/ml and 20.6 ± 10.9 ng/ml also occurring approximately 1 h after ingestion, and with an AUC0-∞ of 26.0 ± 12.0 ng.h/ml and 63.6 ± 30.1 ng.h/ml respectively.Administration of ulipristal acetate (30 mg tablet) together with a high-fat breakfast resulted in approximately 45% lower mean Cmax, a delayed tmax (from a median of 0.75 hours to 3 hours) and 25% higher mean AUC0-∞ compared with administration in the fasted state. Similar results were obtained for the active mono-N-demethylated metabolite. This kinetic effect of food is not expected to be of clinical relevance for daily administration of ulipristal acetate tablets.
DistributionUlipristal acetate is highly bound (>98%) to plasma proteins, including albumin, alpha-l-acid glycoprotein, high density lipoprotein and low density lipoprotein.Ulipristal acetate and its active mono-N-demethylated metabolite are excreted in breast milk with a mean AUCt milk/plasma ratio of 0.74 ± 0.32 for ulipristal acetate.
Biotransformation/EliminationUlipristal acetate is readily converted to its mono-N-demethylated and subsequently to its di-N-demethylated metabolites. In vitro data indicate that this is predominantly mediated by the cytochrome P450 3A4 isoform (CYP3A4). The main route of elimination is through faeces and less than 10% is excreted in the urine. The terminal half-life of ulipristal acetate in plasma following a single dose of 5 or 10 mg is estimated to be about 38 hours, with a mean oral clearance (CL/F) of about 100 l/h.In vitro data indicate that ulipristal acetate and its active metabolite do not inhibit CYP1A2, 2A6, 2C9, 2C19, 2D6, 2E1, and 3A4, or induce CYP1A2 at clinically relevant concentrations. Thus administration of ulipristal acetate is unlikely to alter the clearance of medicinal products that are metabolised by these enzymes.In vitro data indicate that ulipristal acetate and its active metabolite are not P-gp (ABCB1) substrates.
Special populationsNo pharmacokinetic studies with ulipristal acetate have been performed in women with impaired renal or hepatic function. Due to the CYP-mediated metabolism, hepatic impairment is expected to alter the elimination of ulipristal acetate, resulting in increased exposure (see sections 4.2 and 4.4).
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