frameshift mutation / frame-shift mutation; frameshift. A frameshift mutation is a genetic mutation caused by a deletion or insertion in a DNA sequence that shifts the way the sequence is read. A DNA sequence is a chain of many smaller molecules called nucleotides.
As for Flexeril (cyclobenzaprine) is is not a controlled substance under US, Canadian, or international law. Some drugs used as muscle relaxants ARE controlled substances like Valium and many US states and countries have listed Soma (carisoprodol) as a controlled substance (or prohibited it).
Answer: Shouldn't be a problem with either the Tylenol 3 or the naprosyn. Flexeril is a Class B drug for pregnancy(pretty low risk) and is not mentioned as causing any spermatic changes in the PDR. [posted 10/20/1999]. Question: Hello, I have been clean and sober for 7 1/2 years.