yes it can. tachycardia (rapid heart rate) is listed as one of the more common side-effects although i have to say that in my practice i have not seen this very often. some people on flexeril will get a dry mouth tired irritable or nervous. if your symptoms started at the same time that you started the flexeril there could definitely be a connection so please let your medical provider know so that an alternative muscle relaxant can be considered.
does flexeril cause a fast heart rate?