Even when used as directed, the following symptoms may occur: Those that have taken Vicodin in excess to get high reported the following side effects: Side effects from long-term Vicodin abuse include: M365 Pill Withdrawal Symptoms; How to Get Help if Addicted to M365 Pill; Sources:. What Are M365 White Oval Pills? White oval pills with “M365” stamped on one side and a division line on the other are a generic prescription medication also known as hydrocodone bitartrate pills. Hydrocodone bitartrates are a narcotic analgesic that contains hydrocodone and acetaminophen, similar to name brands such as Norco and Vicodin.