People should not buy or use slimming products Carbohydrate Cut, Fat Killer and Sugar-Carbohydrate Cut, and anti-impotence drug Zhuang Yao Gu Shen Capsule as they contain undeclared drug ingredients which can cause serious side-effects.

The three slimming products contain sibutramine and its analogues while the anti-impotence drug contains sildenafil.

Drug alert: People should not buy or use slimming products Carbohydrate Cut, Fat Killer and Sugar-Carbohydrate Cut which contain undeclared drug ingredients which can cause serious side-effects.

The Department of Health today seized three bottles of Fat Killer from retail outlets and 325 bottles of the anti-impotence drug from its distributor.

Distributors have been ordered to recall the products from the market.

Sibutramine is a western drug ingredient used as an appetite suppressant for slimming under close medical supervision. Its side effects include increased blood pressure and heart rate, psychosis and convulsions. People with heart problems should not take it.

Sildenafil's side effects include low blood pressure, headache, vomiting, dizziness and vision disturbances. It can interact with nitrates in some prescription drugs and lower patients' blood pressure to dangerous levels.

Products with sibutramine and sildenafil must be registered before sale and can only be sold on a doctor's prescription and under a pharmacist's supervision.