Creepy Pharmacist: All My Patients are Horrific is a Manga/Manhwa/Manhua in english language, action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

Will this treacherous darkness swallow you up, or will you survive as a unique existence? Lin En accidentally transmigrated into this monstrous world. As a rare human doctor, every one of his patients was moved by his “gentle” treatment and “sincere” service! “Anesthetics? Maybe next time.” “My knife is quick, it’ll be over soon~” Welcome to Bloodsaw Pharmacy, we will serve you wholeheartedly.