Synthetic tranquillisers are mostly barbituric acid derivatives (e.g. veronal, luminal, seconal, amytal and nembutal). Other tranquillisers which are not barbituric acid derivatives are chlordiazepoxide, equanil meprobamate, valium (diazepam), etc. Opium alkaloids such as morphine and codeine are powerful analgesics (reduce pain). Heroin which is morphine diacetate is a widely used narcotic analgesic. Drugs which are used to cure diseases caused by microbes are called antimicrobials. These may be either sulpha drugs such as sulphapyridine, sulphadiazine, sulphaguanidine or they may be antibiotics. Antibiotics such as erythromycin, tetracycline, chloramphenicol which inhibit or arrest the growth of microbes are called bacteriostatic while others which kill the microbes are called bactericidal antibiotics.
The bactericidal and bacteriostatic antibiotics respectively are
A. Penicillin, ofloxacin
B. Erythromycin, tetracycline
C. Penicillin, chloramphenicol
D. Tetracycline and penicillin
