Clindamycin phosphate, a parenteral clindamycin preparation, was given to 92 patients aged from five months to 83 years suffering from a variety of infections. Eighty-two patients were cured and in a further two there was a partial response. Eight patients failed to respond to clindarnycin. Side-effects included pain at the injection site (3), rash (3), diarrhoea (2), phlebitis (1) and pseudo-membranous colitis in one patient who was receiving long-term oral clindamycin hydrochloride following parenteral clindamycin phosphate.