Amoebiasis is a parasitic infection caused by Entamoeba histolytica. Tinidazole is an antiprotozoal drug commonly used to treat amoebiasis by targeting the parasite and disrupting its DNA synthesis, leading to its death. Tolnaftate is an antifungal, Mefloquine is used for malaria, and Verapamil is a calcium channel blocker used for cardiovascular conditions, none of which are effective against amoebiasis.
Thus, the correct answer is Tinidazole.