<unk>  is a centrally acting skeletal muscle relaxant that has significant adverse effects, especially on the central nervous system. Potential side effects of<unk>  include: * Most commonly drowsiness, blurred vision, headache, nausea, and skin rash. *Possible clumsiness (ataxia), upset stomach, flushing, mood changes, trouble urinating, itchiness, and fever. * Both tachycardia (fast heart rate) and bradycardia (slow heart rate) have been reported. *Hypersensitivity reactions and anaphylatic reactions are also reported. *May cause respiratory depression when combined with benzodiazepines, barbiturates, codeine, or other muscle relaxants. * May cause urine to turn black, blue or green. While the product label states that<unk>  can cause jaundice, there is minimal evidence to suggest that<unk>  causes liver damage. During clinical trials of<unk> , there were no laboratory measurements of liver damage indicators, such as serum aminotransferase (AST/ALT) levels, to confirm hepatotoxicity. Although unlikely, it is impossible to rule out that<unk>  may cause mild liver injury with use. Elderly Skeletal muscle relaxants are associated with an increased risk of injury among older adults.<unk>  appeared to be less sedating than other muscle relaxants, most notably cyclobenzaprine, but had similar increased risk of injury.<unk>  is cited along with "most muscle relaxants" in the 2012 Beers Criteria as being "poorly tolerated by older adults, because of anticholinergic adverse effects, sedation, increased risk of fractures," noting that "effectiveness dosages tolerated by older adults is questionable." Pregnancy<unk>  is labeled by the FDA as a pregnancy category C medication. The teratogenic effects of the medication are not known and should be given to pregnant women only when clearly indicated. Overdose There is limited information available on the acute toxicity of<unk> . Overdose is used frequently in conjunction with CNS depressants such as alcohol or benzodiazepines and will have symptoms of nausea, drowsiness, blurred vision, hypotension, seizures, and coma. There are reported deaths with an overdose of<unk>  alone or in the presence of other CNS depressants. Abuse Unlike other carbamates such as meprobamate and its prodrug carisoprodol,<unk>  has greatly reduced abuse potential. Studies comparing it to the benzodiazepine lorazepam and the antihistamine diphenhydramine, along with placebo, find that<unk>  produces increased "liking" responses and some sedative-like effects; however, at higher doses dysphoria is reported. It is considered to have an abuse profile similar to, but weaker than, lorazepam.
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