250 -500 MG FOUR TIMES A DAY. CHILDREN :- 125 -250 MG FOUR TIMES A DAY ACCORDING TO AGE.
GONORRHEA :- 3.5 GM OF AMPICILLIN WITH 1 GM OF PROBENECID ADMINISTERED STIMULTANEOUSLY IS RECOMMENDED.
U.T.I.:- 500 MG GIVEN 8 HOURLY.
TYPHOID AND PARATYPHOID WHERE SALMONELLA TYPHI STRAINS REMAIN SENSITIVE TO AMPICILLIN :- 1 TO 2 GM EVERY 6 HOURS FOR 2 WEEKS IS SUGGSTED FOR ACUTE INFECTIONS, AND FOR 4 TO 12 WEEKS IN CARRIES.
ENDOCARDITIS (IN COMBINATION WITH ANOTHER ANTIBIOTIC IF NECESSARY), BY INTRAVENOUS INFUSION, 2 G EVERY 6 HOURS, INCREASED TO 2 G EVERY 4 HOURS E.G. IN ENTEROCOCCAL ENDOCARDITIS OR IF AMPICILLIN USED ALONE
LISTERIAL MENINGITIS (IN COMBINATION WITH ANOTHER ANTIBIOTIC), BY INTRAVENOUS INFUSION, 2 G EVERY 4 HOURS FOR 10 - 14 DAYS; NEONATE 50 MG/KG EVERY 6 HOURS; INFANT 1 - 3 MONTHS, 50 - 100 MG/KG EVERY 6 HOURS; CHILD 3 MONTHS - 12 YEARS, 100 MG/KG EVERY 6 HOURS (MAX. 12 G DAILY)