All drugs, including many antibiotics, anti-depressants, steroids, anti-histamines, cholesterol reducing drugs all have side effects. No drug is safe !

Here are a few samples :-

Antibiotics (Erythromycin, Neomycin, Tetracyolines, Penicillin)

Main side effects :-

Stomach irritation, diarrhea, liver and kidney damage, anemia, seizures.

Non-steroidal anti inflammatory drugs -NSAIDS (Aspirin, Paracetamol, Panadol, Anadin)

Main side effects :-

Stomach bleeding, stomach ulcers, breathing problems, diarrhea, liver and kidney damage, nausea.

Anti-histamines (Dimatane, Phenergan, Actidil, Hismanal)

Main side effects :-

Constipation, diarrhea, mood swings, vision (effects your vision), dizziness, drowsiness, memory loss, nausea, vomiting.

Tranquillizers (Diazepam, Dalmane, Tranxene, Ativan)

Main side effects :-

Drowsiness, dizziness and fainting, lack of co-ordination, changes in white blood cells, hallucinations, hearing difficulties, breathing difficulties, impaired thinking, memort loss, vision disturbances.