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.
As far as I know this medication (Mobic) is prescribed for arthritis. For pain I took a muscle relaxer Flexeril and it worked since the first day I took it. In 2 days I was pain free in my neck, arms and shoulders after having non stop pain and numbness for months. Read More. My Dr. had prescribed my Flexeril 10mg for my back spasms.