Muscle Spasm
"I find Flexeril &#039;tops&#039; for killing muscle pain associated with spasm, knots and/or injury. Compared to Valium (which I also have) the Flexeril does a better job for the actual pain &amp; spasm. However, Flexeril does have heavy side effects which could discourage first time users: 
- Dry mouth and eyes.
- A &#039;tight feeling&#039; of the upper chest &amp; bronchioles (very similar to what a high dose of Benadryl does).
- Slightly blurry vision.
- A substantial drowsiness which, for me, occurs about 4 hours after taking the dose. It becomes a struggle to stay awake. 

Definitely never go above the recommended dose - because of the harsh side effects."