e. Quinine. Quinine is an alternative drug in the treatment of malaria strains
resistant to other modes of treatment. This agent acts only on the blood stages of the
parasite. Side effects include gastrointestinal irritation, tinnitus, vertigo, headache, and
f. Doxycycline (Vibramycin). Doxycycline is use prophylactically for
P. falciparum in short-term travelers to areas with chloroquine resistant strains. Side
effects include GI upset and superinfection.