Hyperkalemia is a common side effect of these medications. GI disturbances, including nausea, vomiting, diarrhea, anorexia can occur. Triamterene and spironolactone have been known to cause impotence and sexual dysfunction. Spironolactone may precipitate gynecomastia or an SLE-like syndrome.
Flexeril has a half life of 18 hours. So 5x18 is 90 hours. Or just under 4 days. Of course, it is not that easy. This varies on how much and how long the drug was taken and it can vary from person to person. That being said I cannot image any way that flexeril would be detectable 30 days after the last dose.
When you stop taking Flexeril, you may experience certain unpleasant symptoms called âa discontinuation or withdrawal syndrome.â Flexeril is only supposed to be used for two weeks, but when people use it for years or abuse it in large amounts, they are more likely to develop the syndrome.yclobenzaprine, sold under the brand name Flexeril, is a muscle relaxant commonly prescribed for injuries and sprains. In 2012, doctors wrote over 26 million prescriptions for it, making it widely available.