Contraceptives are birth-control drugs and are used to prevent pregnancy. Estrogen and progestin are two female sex hormones. Combinations of estrogen and progestin work by preventing ovulation (the release of eggs from the ovaries). Examples are: Drospirenone, Ethinyl Estradiol, Desogestrel, Levonorgestrel, etc. Antacids are used to reduce the acidity in stomach. E.g- Omeparazole, Ranitidine, etc. Gemifloxacin is Quinolones or Fluoroquinolone class antibiotic.