ALCOHOL AND ANTIDIABETICS

Diabetics receiving insulin, oral antidiabetics, or diet alone need not abstain from alcohol, but they should drink only in moderation and accompanied by food. Alcohol makes the signs of hypoglycaemia less clear, and delayed hypoglycaemia can occur.
The CNS depressant effects of alcohol in association with hypoglycaemia can make driving or the operation of dangerous machinery much more hazardous. Metformin does not carry the same risk of lactic acidosis seen with phenformin and it is suggested by the British Diabetic Association that one or two drinks a day are unlikely to be harmful to those taking metformin. A flushing reaction is common in patients taking chlorpropamide who drink alcohol, but is rare with other sulphonylureas.
Diabetics are advised not to exceed 2 drinks (for women) or 3 drinks (for men) daily and limit the intake of drinks with high-carbohydrate content (e.g. sweet sherries, liqueurs). Diabetics should not drink on an empty stomach and they should know that the warning signs of hypoglycaemia may possibly be obscured by the effects of the alcohol and that the hypoglycaemic effects of alcohol may occur several hours after drinking. The chlorpropamide-alcohol interaction (flushing reaction) is very well documented, but of minimal importance. It is a nuisance and possibly socially embarrassing but normally requires no treatment. Patients should be warned.
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