Co-amilozide is indicated in patients with hypertension, congestive heart failure, or hepatic cirrhosis with ascites, in whom potassium depletion might be anticipated. Amiloride hydrochloride in co-amilozide minimises the possibility of excessive potassium loss during vigorous diuresis for long term therapy. Co-amilozide is particularly indicated in conditions where potassium balance is important, eg patients with congestive heart failure receiving digitalis.
4.2 Posology and method of administration
The rate of loss of weight and the serum electrolyte levels should determine the dosage. The most satisfactory rate of weight loss after initiation of diuresis is about 0.5-1.0 kg/day.
Hypertension: Initially one tablet given once a day. The dosage may be increased if necessary to two tablets given once a day or in divided doses.
Co-amilozide may be used alone or as an adjunct to other antihypertensive drugs, but since the antihypertensive effect of these agents may be enhanced, their dosage may need to be reduced in order to reduce the risk of an excessive drop in pressure.
Congestive heart failure: Initially one tablet a day, subsequently adjusted if required, but not exceeding four tablets a day. Optimal dosage is determined by the diuretic response and the plasma potassium level. Once initial diuresis has been achieved, reduction in dosage may be attempted for maintenance therapy. Maintenance therapy may be on an intermittent basis.
Hepatic cirrhosis with ascites: Initiate therapy with a low dose. A single dose of two tablets may be increased gradually until there is an effective diuresis. Dosage should not exceed four tablets a day. A gradual weight reduction is especially desirable in cirrhotic patients to reduce the likelihood of untoward reactions associated with diuretic therapy. Maintenance dosages may be lower than those required to initiate diuresis; dosage reduction should therefore be attempted when the patient's weight is stabilised.
Elderly: Particular caution is needed in the elderly because of their susceptibility to electrolyte imbalance. The dosage should be carefully adjusted to renal function and clinical response. (See also Special Warnings & Precautions, subsections - Hyperkalaemia, Electrolyte imbalance).
Children: Co-amilozide is not recommended for children under 18 years of age as safety and efficacy has not been established.
For full data sheet go to: https://www.medicines.org.uk/emc/product/2372/smpc
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