Other similar compounds are procaine and benzocaine. The esters include benzocaine, procaine, tetracaine, and chloroprocaine. Heroin is commonly cut with quinine, caffeine, dimethocaine, procaine, lactose, inositol, dextrose, mannitol, and starch. It is not recommended in those with a history of penicillin allergy or procaine allergy. Less common drugs in ecstasy include diphenhydramine, acetaminophen, 5-MeO-DiPT, 2C-B, procaine, and phencyclidine (PCP). Novocaine is the commercial name for procaine, a local anesthetic. A mixture of procaine hydrochloride and vitamins, along with liver and cactus, is prescribed. Prior to the discovery of amylocaine and procaine, cocaine was a commonly used local anesthetic. As a result, procaine was discovered, which has similar cardiac effects as quinidine. He advocated the use of procaine, synthetic antihistamines, Diparcol (diethazine), tetraethylammonium bromide and vitamin B1. The primary use for procaine is as an anaesthetic. The structure of dimethocaine, being a 4-Aminobenzoic acid ester, resembles that of procaine. Other issues may occur because of varying individual tolerance to procaine dosage. Researchers have simulated this zombie state by injecting procaine into the SEG. It can be reacted with 4-aminobenzoic acid to make procaine.