Antibiotic
(Quinolons) eg. -Levofloxacin
-Ciprofloxacine
-Pefloxacine
-Ofloxacin

Anti-Acids
e.g.
- Relcer
- Zolicid
- Maloox - etc.

- Reduced
  ant-biotic   potency
- Seizures
- Nausea

Give an allowance of at least 2 hrs gap in between different medicines.  

Antibiotic  
( Imidazoles )  
e.g. -Metronidazole (flagyl)
-New Imidazoles (Dazolic)
- Secnidazole

Alcohol
e.g. Beer & win

Very serious side effects e.g.
- confusion,
- fast hearbeat
- low blood pressure  (hypotension;

Finish your medicine prescription first, then allow at least 48 hrs before taking any alcohol.