A recently approved drug for weight loss called Contrave contains 8mg of the drug naltrexone combined with 90mg of bupropion (marketed on its own as Wellbutrin). Naltrexone was first approved in a dose of 50mg per day for helping opioid and alcohol addicts improve their chances of getting sober. The lower doses were proposed later by healthcare professionals who found that the drug could benefit a variety of other health…