Muscle spasm, local pain and tenderness, limitation of motion, and restriction in activities of daily living were evaluated. This risk is increased with concurrent abuse of alcohol and other substances. Flexeril Overdose Overdosing on Flexeril may give upward fall to the following symptoms: exasperate in breathing, nervousness, flushing, hallucinations, seizures, instantaneous feelings all in apparent, at interminably tiredness, and vomiting. Cyclobenzaprine did not demonstrate mutagenic activity in the male mouse at dose levels of up to 20 times the human kopa billiga generiska cyclobenzaprine dose. 5, and 10 mg tablets intended for short-term to week oral administration. Think my headaches are from spasms in neck muscles around my cervical spine, but am not really sure.