Al Tropico Del Cancro (1972)
aka's: Tropic Of Cancer/Death In Haiti
Gabriele Tinti and Anita Strindberg play a couple who are vacationing in Haiti and happen to stumble upon an old doctor friend, Dr. Williams (Anthony Steffen). Dr. Williams has developed a powerful new hallucinogenic drug and there are quite a few different parties interesting in acquiring the formula. Soon enough people start to die as the race for the drug intensifies. (In Italian language, with English subtitles).