Pharmacotherapeutic group: Glucocorticosteroid ATC code: A07EA06
The exact mechanism of budesonide in the treatment of Crohn's disease is not fully understood. Data from clinical pharmacology studies and controlled clinical trials strongly indicate that the mode of action of Budenofalk 3mg capsules is predominantly based on a local action in the gut. Budesonide is a glucocorticosteroid with a high local anti-inflammatory effect. At doses clinically equivalent to systemically acting glucocorticosteroids, budesonide gives significantly less HPA axis suppression and has a lower impact on inflammatory markers.
Budenofalk 3mg capsules show a dose-dependent influence on cortisol plasma levels which is at the recommended dose of 9 mg budesonide/day significantly smaller than that of clinically equivalent effective doses of systemic glucocorticosteroids.
Clinical efficacy and safety
Crohn's disease
Clinical study in adult patients with Crohn's disease
In a randomized, double-blind, double-dummy trial in patients with mild to moderate Crohn's disease (200 < CDAI < 400) affecting the terminal ileum and/or the ascending colon the efficacy of 9 mg budesonide in a single daily dose (9 mg OD) was compared to the treatment with 3 mg budesonide given three times daily (3 mg TID).
The primary efficacy endpoint was the proportion of patients in remission (CDAI < 150) at week 8.
A total of 471 patients were included in the study (full analysis set, FAS), 439 patients were in the per protocol (PP) analysis set. There were no relevant differences in the baseline characteristics in both treatment groups. At the confirmatory analysis, 71.3% of the patients were in remission in the 9 mg OD group and 75.1% in the 3 mg TID group (PP) (p = 0.01975) demonstrating the non-inferiority of 9 mg budesonide OD to 3 mg budesonide TID.
No drug-related serious adverse events were reported.
Clinical studies in paediatric patients with Crohn's disease
Two randomised controlled studies with Budenofalk 3mg capsules included patients in the age range of 8 to 19 years with mildly to moderately active Crohn's disease (PCDAI [paediatric CD activity index] 12.5-40) with ileal, ileocolonic or isolated colonic inflammation.
In one study a total of 33 patients were treated with 9 mg budesonide (3 mg TID) daily for 8 weeks followed by 6 mg budesonide daily during week 9 and 3 mg budesonide daily in week 10 or with prednisone (40 mg/d for two weeks, tapered to zero in steps of 5 mg/week). Remission (PCDAI ≤ 10) was achieved in 9/19 (47.3%) of the patients in the budesonide group (both at week 4 and 12) and 8/14 (57.1%, at week 4) and 7/14 (50%, at week 12) of the patients in the prednisone group.
A second study including 70 children with CD compared two dosing schedules of budesonide: Patients in group 1 were treated for 7 weeks with 9 mg /day budesonide (3 mg TID) followed by 6 mg/day budesonide (3 mg BID) for additional 3 weeks. In group 2, patients were treated for 4 weeks with 12 mg/d budesonide (3 mg TID and 3 mg OD) and thereafter for each of 3 weeks with 9 mg/d budesonide (3 mg TID) and 6 mg/day budesonide (3 mg BID), respectively. Mean decrease of PCDAI at week 7 was defined as primary efficacy end point. There was a relevant decrease in the PCDAI in both treatment groups. The decrease was more pronounced in group 2 but the difference between the groups did not reach statistical significance (n.s.). Secondary efficacy endpoints: Improvement (defined as a decrease of PCDAI ≥ 10 points) was seen in 51.4% of the patients in group 1 and 74.3% of the patients in group 2 (n.s.); remission (PCDAI ≤ 12.5) was found in 42.9% of the patients in the first group versus 65.7% in the second group (n.s.).
Microscopic colitis
Clinical studies in induction of remission in collagenous colitis
Efficacy and safety of budesonide for induction of remission in collagenous colitis were evaluated in two prospective double-blind (DB), randomized, placebo-controlled, multicentre studies with patients with active collagenous colitis.
In one study, 30 patients were randomized to a treatment with 9 mg budesonide per day, 25 patients to a treatment with 3 g mesalazine per day, and 37 to placebo. The primary efficacy variable was the rate of patients in clinical remission, defined as ≤ 3 stools per day. 80% of the patients treated with budesonide, 44% of the patients treated with mesalazine and 59.5% of the patients in the placebo-group reached the primary endpoint (budesonide vs. placebo = 0.072). According to another definition of clinical remission taking into account also the stool consistency, i. e. a mean of < 3 stools per day and a mean of < 1 watery stool per day in the last 7 days prior to the last administration of the study drug, 80% of the patients in the budesonide group, 32.0% of the patients in the mesalazine group and 37.8% of the patients in the placebo group achieved remission (budesonide vs. placebo: p < 0.0006). Budesonide was safe and well tolerated. None of the adverse events in the budesonide group was considered drug related.
In another study 14 patients were randomized to a treatment with 9 mg budesonide per day and 14 were randomized to placebo. The primary efficacy variable was clinical response defined as a drop to ≤ 50 % of the disease activity at baseline with clinical disease activity defined as the numbers of stools during the last 7 days. 57.1% of patients in the budesonide group and 21.4% in the placebo group achieved clinical response (p = 0.05). Budesonide was safe and well tolerated. No serious adverse drug reactions occurred in the budesonide group.
Clinical study in maintenance of remission in collagenous colitis
Clinical efficacy and safety of budesonide in the maintenance of remission in collagenous colitis were evaluated in a prospective double-blind (DB), randomized, placebo-controlled, multicentre study with patients with quiescent collagenous colitis.
The primary endpoint was the proportion of patients in clinical remission over 52 weeks. Remission was defined as a mean of < 3 stools/day, thereof a mean of < 1 watery stool/day during the week prior to the final visit and with no relapse during the 1-year course. Relapse was defined as a mean of ≥ 3 stools/day thereof a mean of ≥ 1 watery stool/day during the previous week.
92 patients were randomised to treatment in the DB phase (44 budesonide, 48 placebo) and took at least one dose of the study medication (full analysis set, FAS). The posology was 6 mg budesonide/day alternating with 3 mg budesonide/day (corresponding to an average daily dose of 4.5 mg budesonide). In the final analysis, significantly more patients in the budesonide group (61.4%) compared to patients in the placebo group (16.7%) reached the primary endpoint, demonstrating the superiority of budesonide over placebo (p < 0.001).
Clinical study in induction of remission in lymphocytic colitis
Clinical efficacy and safety of budesonide in the induction of remission in lymphocytic colitis were evaluated in a prospective, double-blind (DB), double-dummy, randomized, placebo-controlled, multicentre study with patients with active lymphocytic colitis.
The primary endpoint was the rate of clinical remission, defined as a maximum of 21 stools, thereof not more than 6 watery stools in the last 7 days prior to the last visit.
57 patients were randomised (each 19 patients in the budesonide group, mesalazine-group and placebo-group) and took at least one dose of the study medication (budesonide: 9 mg OD; mesalazine: 3 g OD). The treatment duration was 8 weeks.
In the confirmatory analysis, significantly more patients in the budesonide group (78.9%) compared to patients in the placebo-group (42.1%) reached the primary endpoint, showing the superiority of budesonide over placebo (p = 0.010). 63.2% of the patients in the mesalazine group reached remission (p = 0.097).
Autoimmune hepatitis
Clinical study in adult patients with autoimmune hepatitis
In a prospective, double-blind, randomised, multicentre trial, 207 patients with autoimmune hepatitis (AIH) without cirrhosis were treated with initial daily doses of 9 mg/d budesonide (n = 102) for up to 6 months or 40 mg/d prednisone (tapered to 10 mg/d, n = 105). Upon biochemical remission, the budesonide dose was reduced to 6 mg/d. Patients also received 1-2 mg/kg/d azathioprine throughout the study. The composite primary endpoint was complete biochemical remission (i.e. normal serum levels of aspartate- and alanine-aminotransferase) without occurrence of predefined steroid-specific side effects at 6 months. This primary endpoint was achieved in 47% of the patients in the budesonide group and 18% of the patients in the prednisone group (p < 0.001).
Regarding secondary efficacy variables, at 6 months, complete biochemical remission occurred in 60% and 39% of the patients in the budesonide group and in the prednisone group, respectively (p = 0.001). 72% and 47% of the patients in the budesonide group and in the prednisone group, respectively, did not develop steroid-specific side-effects (p < 0.001). The mean decrease in IgG and γ-globulin concentrations and the decrease in the rates of patients with elevated IgG and γ - globulin concentrations did not show any differences between treatment groups.
An open-label, follow-up treatment of additional 6 months was offered to all patients after the controlled, double-blind phase. A total of 176 patients proceeded to this open-label phase and received 6 mg/d budesonide in combination with 1-2 mg/kg/d azathioprine. Rates of patients with biochemical remission and rates of patients with complete response (not statistically significant) were still higher in the original budesonide group (complete response rate 60% and biochemical remission 68.2% at the end of the open label phase) than in the original prednisone group (complete response rate 49% and biochemical remission 50.6% at the end of the open label phase).
Clinical study in paediatric patients with autoimmune hepatitis
The safety and efficacy of budesonide in 46 paediatric patients (11 males and 35 females) aged 9 to 18 years were studied as a subset of patients of the above mentioned clinical study. 19 paediatric patients were treated with budesonide and 27 received the active control (prednisone) for induction of remission with a daily dose of 9 mg budesonide. After 6 months in the study, 42 paediatric patients continued for a further 6 months on open label, follow up treatment with budesonide.
The rate of complete responders (defined as biochemical response, i.e. normalisation of liver transaminases (ASAT, ALAT) and lack of steroid-specific side-effects) in patients aged ≤ 18 years was considerably lower compared to adult patients. There was no significant difference seen between the treatment groups. After follow up treatment with budesonide for a further 6 months, the rate of paediatric patients with complete response was still slightly lower compared to adult patients but the difference between the age groups was much smaller. There was no significant difference in the rate of complete responders between those originally treated with prednisone and those treated continuously with budesonide.