When Laxman was injured during the battle against Ravana, Lord Rama was informed that the Sanjeevani herb from the Himalayas could cure him. Lord Hanuman could not find the herb, so after fighting off Kalanemi, who had been sent by Ravana, he famously brought the whole mountain. Had Ravana changed his strategy and planted a poisonous/do-nothing look-alike herb in a visible place, then Hanuman and Laxman would be no different from the millions of Indians today who purchase/consume fake/substandard/adulterated medication.