Skeletal Muscle Relaxants Like the TCAs, cyclobenzaprine has anticholinergic properties and may cause dry mouth, blurred vision, increased intraocular pressure, urinary retention, and constipation.Click to see full answer. Similarly, can muscle relaxers relieve constipation?Magnesium is a muscle relaxant, and it is a primary ingredient in many laxative medications. It can relax the bowels to alleviate constipation. According to some research, magnesium oxide is safe for people with mild constipation to use. Standard doses typically produce a bowel movement within 6 hours.Also, can muscle relaxers cause stomach problems? Side Effects Associated with Muscle Relaxers Dry mouth. Constipation. Nausea. Simply so, what are the side effects of muscle relaxers? The most common side effects include: Tiredness, drowsiness, or sedation effect. Fatigue or weakness. Dizziness. Dry mouth. Depression. Decreased blood pressure. How do muscle relaxers make you feel?These drugs exert their muscle-relaxing effects by inhibiting nerve signals in the brain and spinal cord and may help break the pain-spasm-pain cycle, where pain causes your muscles to spasm as a protective response, and those spasms, in turn, cause more pain.