A Ghanaian entrepreneur thinks he has the answer to Africa’s fake medicine problem ... Drug Lane runs through a market in the heart of Accra, Ghana. It’s past the office towers going up to the east of the central business district, past the pushy vendors with fake Louis Vuitton luggage, and past the women selling trays of raw beef under the midday sun. The alley bristles with signboards for pills, powders, and other substances. One store is packed to the rafters with boxes of painkillers and antibiotics. On the wall are two posters: One is for Coartem, a malaria treatment made by the Swiss drug company Novartis, and the other advertises something called Recharger, supposedly made from the male silkworm moth. ... Like 85 percent of the people selling medicine in Ghana, he isn’t a pharmacist. Most of his stock comes from China, India, and Malaysia, imported by Ghanaian distributors who supply everyone from “licensed chemical sellers” like him to actual pharmacies and hospitals. It’s a system so porous that as many as one in three medicines sold on Drug Lane could be counterfeit, according to the U.S. Centers for Disease Control and Prevention, compared with about 1 percent in the U.S. and Europe. The fake drugs often have no active ingredient at all, or just enough to pass quality-control tests, and visually they can be indistinguishable from the real thing. ... MPedigree sells software that manufacturers use to label individual packs of medication with a random 12-digit code hidden under a scratch-off panel on the packaging. When a person buys medicine, she can text the code to MPedigree for free and get an instant reply telling her whether the product is authentic.