Not medical advice: A small yellow pill with the imprint TL 177 on one side has been identified as 10 mg of Cyclobenzaprine hydrochloride. It is sold under the brand names Amrix, Pac with Cyclobenzaprine, Fexmid, and Flexeril. The prescription-only drug is a muscle relaxant and should not be used if you have taken MAO inhibitors in the past 14 days.
Common side effects include: dizziness, drowsiness, loss of appetite, constipation, gas, nausea, blurred vision, dry throat or mouth, and muscle weakness.
Tonix Pharmaceuticals Holding Corp recently completed a study on TNX-102 SL. The very low dose Cyclobenzaprine drug was created to improve the symptoms of fibromyalgia through higher sleep quality. Fibromyalgia is a syndrome characterized by chronic muscle pain, fatigue, and difficulty sleeping. A TNX-102 SL clinical trial is scheduled for the first quarter of 2013.