Welcome to the medhelp neurology forum. Flexeril or
cyclobenzaprine or
baclofen are not associated with hoarseness of voice. More plausible causes of hoarseness of voice need to be checked like acute laryngitis, vocal cord nodules, allergies, gastro esophageal reflux, smoking, thyroid problems, trauma to larynx, parkinson’s disease and trauma to larynx. Consult an otolaryngologist who will evaluate the causes and treat likewise.