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.
1 How long does it take your system to flush out the effects of flexeril? Dr. Syed H. Sajid Dr. Sajid. Half life 8-37 hrs.: Half life of cyclobenzaprine ranges from 8-37 hours, with the average half life being approximately 18 hrs. It is metabolized in the liver through the cyp450 enzyme system. So, the effects of Flexeril may leave your system in approximately 18 hours.