Amlodipine 5 mg tablets

Each tablet contains Amlodipine besilate equivalent to 5 mg of amlodipine.

For a full list of excipients, see section 6.1.

Tablet

White or almost white, flat, bevelled edges, barrel-shaped tablet debossed with "C" on one side and "58" on the other side.

Chronic stable and vasospastic angina pectoris.

Essential hypertension.

For oral use.

The tablets should be taken with a glass of liquid (e.g. a glass of water) with or without food.

In adults

For the treatment of hypertension and angina pectoris, the starting dose is 5 mg once daily. If the desired therapeutic effect cannot be achieved within 2-4 weeks, the dose can be increased to a maximum of 10 mg daily (given as a single dose) depending on the individual response of the patient. Amlodipine can be used as monotherapy or in combination with anti-anginal medication in patients suffering from angina pectoris.

Children with hypertension from 6 years to 17 years of age

The recommended antihypertensive oral dose in pediatric patients ages 6-17 years is 2.5 mg once daily as a starting dose, up-titrated to 5 mg once daily if blood pressure goal is not achieved after 4 weeks. Doses in excess of 5 mg daily have not been studied in pediatric patients (see section 5.1 and section 5.2). The effect of amlodipine on blood pressure in patients less than 6 years of age is not known

The 2.5 mg dose cannot be obtained with Amlodipine 5 mg tablets as these tablets are not manufactured to break into two equal halves.

Elderly patients

For elderly patients, the normal dose is recommended; however, caution is advised when the dose is increased (see section 5.2).

Patients with renal impairment

The normal dosage is recommended (see section 5.2). Amlodipine is not dialyzable. Amlodipine should be administered with particular caution to patients undergoing dialysis (see section 4.4).

Patients with hepatic impairment

In patients with hepatic impairment, no dosage regimen has been defined, therefore amlodipine should be administered with caution (see section 4.4).

Amlodipine is contraindicated in patients with:

- hypersensitivity to amlodipine, other dihydropyridines or any of the excipients

- severe hypotension

- shock (including cardiogenic shock)

- obstruction of the outflow tract of the left ventricle (e.g. high grade aortic stenosis)

- haemodynamically unstable heart failure after acute myocardial infarction

The safety and efficacy of amlodipine in hypertensive crisis has not been established.

Patients with cardiac failure:

Patients with heart failure should be treated with caution. In a long-term, placebo controlled study in patients with severe heart failure (NYHA class III and IV) the reported incidence of pulmonary oedema was higher in the amlodipine treated group than in the placebo group, but this was not associated with worsening of the heart failure (see section 5.1).

Use in patients with impaired hepatic function:

The half life of amlodipine is prolonged in patients with impaired liver function; dosage recommendations have not been established. Amlodipine should therefore be administered with caution in these patients.

Use in elderly patients

In elderly patients, caution is advised when the dosage is increased (see section 5.2).

Use in renal failure

Amlodipine may be used in such patients at normal doses. Changes in amlodipine plasma concentrations are not correlated with degree of renal impairment. Amlodipine is not dialyzable

Effects of other medicinal products on amlodipine

CYP3A4 inhibitors: With concomitant use with the CYP3A4 inhibitor erythromycin in young patients and diltiazem in elderly patients respectively the plasma concentration of amlodipine increased by 22% and 50 % respectively. However, the clinical relevance of this finding is uncertain. It cannot be ruled out that strong inhibitors of CYP3A4 (e.g. ketoconazole, itraconazole, ritonavir) may increase the plasma concentrations of amlodipine to a greater extent than diltiazem. Amlodipine should be used with caution together with CYP3A4 inhibitors. However, no adverse events attributable to such interaction have been reported.

CYP3A4 inducers: There is no data available regarding the effect of CYP3A4 inducers on amlodipine. The concomitant use of CYP3A4 inducers (e.g. rifampicin, hypericum perforatum) may give a lower plasma concentration of amlodipine. Amlodipine should be used with caution together with CYP3A4 inducers.

In clinical interaction studies grapefruit juice, cimetidine, aluminium/ magnesium (antacid) and sildenafil did not affect the pharmacokinetics of amlodipine.

Effects of amlodipine on other medicinal products

The blood pressure lowering effects of amlodipine adds to the blood pressure-lowering effects of other antihypertensive agents.

In clinical interaction studies, amlodipine did not affect the pharmacokinetics of atorvastatin, digoxin, ethanol (alcohol), warfarin or cyclosporin.

There is no effect of amlodipine on laboratory parameters.

Pregnancy

The safety of amlodipine in human pregnancy has not been established.

Reproductive studies in rats have shown no toxicity except for delayed date of delivery and prolonged duration of labour at dosages 50 times greater than the maximum recommended dosage for humans.

Use in pregnancy is only recommended when there is no safer alternative and when the disease itself carries greater risk for the mother and foetus.

Lactation

It is not known whether amlodipine is excreted in breast milk. A decision on whether to continue/discontinue breast-feeding or to continue/discontinue therapy with amlodipine should be made taking into account the benefit of breast-feeding to the child and the benefit of amlodipine therapy to the mother.

Amlodipine can have minor or moderate influence on the ability to drive and use machines. If patients taking amlodipine suffer from dizziness, headache, fatigue or nausea the ability to react may be impaired.

The following undesirable effects have been observed and reported during treatment with amlodipine with the following frequencies: 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).

*mostly consistent with cholestatis

In humans experience with intentional overdose is limited

Symptoms:

Available data suggest that gross overdosage could result in excessive peripheral vasodilatation and possibly reflex tachycardia. Marked and probably prolonged systemic hypotension up to and including shock with fatal outcome have been reported.

Treatment:

Clinically significant hypotension due to amlodipine overdosage calls for active cardiovascular support including frequent monitoring of cardiac and respiratory function, elevation of extremities and attention to circulating fluid volume and urine output.

A vasoconstrictor may be helpful in restoring vascular tone and blood pressure, provided that there is no contraindication to its use. Intravenous calcium gluconate may be beneficial in reversing the effects of calcium channel blockade.

Gastric lavage may be worthwhile in some cases. In healthy volunteers the use of charcoal up to 2 hours after administration of amlodipine 10 mg has been shown to reduce the absorption rate of amlodipine.

Since amlodipine is highly protein-bound, dialysis is not likely to be of benefit.

Pharmacotherapeutic group: Selective calcium channel blockers with mainly vascular effects; Dihydropyridine derivatives

ATC code: C 08 CA 01

Amlodipine is a calcium antagonist that inhibits the influx of calcium ions into the cardiac and vascular smooth muscle. The mechanism of the antihypertensive action is the result of the direct relaxing effect on the arterial smooth muscle.

The mechanism that enables amlodipine to reduce angina pectoris has not been completely clarified; however, the two following mechanisms are involved:

1. Amlodipine dilates peripheral arterioles and thus, reduces the total peripheral resistance (afterload) against which the heart works. This reduction of the heart load leads to a reduction of the energy consumption as well as of the oxygen requirements of the myocardium.

2. The dilatation of the main coronary vessels and coronary arterioles probably is involved in the mechanism of action of amlodipine. This dilatation increases the myocardial oxygen supply in patients suffering from Prinzmetal's angina pectoris.

In patients suffering from hypertension, once daily administration produces a clinically significant reduction in blood pressure (both in lying and standing position), lasting for 24 hours.

In patients suffering from angina pectoris, once daily administration increases total exercise time, the time to occurrence of angina and the time to a 1 mm ST segment depression. Amlodipine reduces both the frequency of anginal attacks and the use of glyceryl trinitrate tablets.

Use in Patients with Heart Failure

Haemodynamic studies and exercise based controlled clinical trials in NYHA Class II-IV heart failure patients have shown that amlodipine did not lead to clinical deterioration as measured by exercise tolerance, left ventricular ejection fraction and clinical symptomatology.

A placebo controlled study (PRAISE) designed to evaluate patients in NYHA Class III-IV heart failure receiving digoxin, diuretics and angiotensin-converting enzyme (ACE) inhibitors has shown that amlodipine did not lead to an increase in risk of mortality or combined mortality and morbidity in patients with heart failure.

In a follow-up, long-term, placebo controlled study (PRAISE-2) of amlodipine in patients with NYHA III and IV heart failure without clinical symptoms or objective findings suggestive of underlying ischaemic disease, on stable doses of ACE inhibitors, digitalis, and diuretics, amlodipine had no effect on total or cardiovascular mortality. In this same population amlodipine was associated with increased reports of pulmonary oedema despite no significant difference in the incidence of worsening heart failure as compared to placebo.

Use in Children with Hypertension, aged 6-17 years

In a study involving 268 children aged 6-17 years with predominantly secondary hypertension, comparison of a 2.5mg dose, and 5.0mg dose of amlodipine with placebo, showed that both doses reduced Systolic Blood Pressure significantly more than placebo. The difference between the two doses was not statistically significant.

The long-term effects of amlodipine on growth, puberty and general development have not been studied. The long-term efficacy of amlodipine on therapy in childhood to reduce cardiovascular morbidity and mortality in adulthood have also not been established.

Absorption and distribution

After oral administration of therapeutic doses, amlodipine is slowly absorbed from the gastrointestinal tract. The bioavailability of amlodipine is not influenced by concomitant intake of food. The absolute bioavailability of the unchanged active substance is approximately 64-80%. Peak plasma concentrations are reached within 6-12 hours after administration. The volume of distribution is approximately 20 l/kg. The pKa of amlodipine is 8.6. In vitro plasma protein binding is approximately 98%.

Metabolism and elimination

The plasma half-life varies between 35 and 50 hours. Steady-state plasma concentration is reached after 7-8 days.

Amlodipine is extensively metabolised into inactive metabolites. Approximately 60% of the administered dose is excreted in the urine, 10% of which is in a non-metabolised form.

Use in Elderly

The time to reach peak plasma concentrations of amlodipine is similar in elderly and younger subjects. Amlodipine clearance tends to be decreased with resulting increases in AUC and elimination half life in elderly patients. Increases in AUC and elimination half life in patients with congestive heart failure were as expected for the patient agze group study (See Section 4.4).

Patients with impaired renal function

Amlodipine is extensively metabolised into inactive metabolites. 10% of the parent compound is excreted unchanged in the urine. The changes in the plasma concentration of amlodipine are not related to the degree of renal impairment. These patients can be treated with a normal dosage of amlodipine. Amlodipine is not dialyzable.

Patients with impaired hepatic function

The half-life of amlodipine is prolonged in patients with impaired hepatic function.

Use in Children and Adolescents

A population PK study has been conducted in 74 hypertensive children aged from 12 months to 17 years (with 34 patients aged 6 to 12 years and 28 patients aged 13 to 17 years) receiving amlodipine between 1.25 and 20 mg given either once or twice daily. In children 6 to 12 years and in adolescents 13-17 years of age the typical oral clearance (CL/F) was 22.5 and 27.4 L/hr respectively in males and 16.4 and 21.3 L/hr respectively in females. Large variability in exposure between individuals was observed. Data reported in children below 6 years is limited.

Animal studies have shown no special risks for humans. This is based on information from pharmacological studies concerning safety and on information on repeat dose toxicity, genotoxicity and carcinogenicity. Reproductive studies in animals have shown a delayed parturition, difficult labour and an increased foetal and neonatal death at high dosages.

Microcrystalline cellulose

Calcium hydrogen phosphate, anhydrous

Sodium starch glycolate

Magnesium stearate

Not applicable.

3 years

This medicinal product does not require any special storage conditions.

PVC/ PVdC-Aluminium blister.

7, 10, 14, 15, 20, 28, 30, 50, 56, 60, 84, 90, 98, 100, 120, 200, 250, 300 and 500 tablets

Not all pack sizes may be marketed.

No special requirements.

Milpharm Limited

Ares, Odyssey Business Park

West End Road

South Ruislip HA4 6QD

United Kingdom

PL 16363/0249

11/05/2011

11/05/2011