Singulair is a prescription medication that contains the active ingredient montelukast. This medication is indicated to prevent breathing difficulties associated with asthma or exercise-induced asthma. People who experience nasal allergies may also experience relief from uncomfortable symptoms while taking Singulair. The side effects of Singulair on the muscles are limited, but patients should discuss these effects with a doctor if they occur.
Weakness
In clinical trials for Singulair, approximately 2 percent of patients reported experiencing fatigue or muscle weakness, also called asthenia, as side effects of treatment, according to Merck, the pharmaceutical distributor of this medication. Asthenia can make it difficult for affected patients to move about normally or participate in their usual physical activities.
Tremors or Shaking
Unusual muscle tremors or involuntary shaking can arise in certain patients taking Singulair. Muscle tremors can occur intermittently throughout treatment and can be disruptive to affected patients. Patients who develop these side effects should seek prompt medical care, as tremors can indicate a severe reaction to Singulair, Drugs.com advises.
Additional Side Effects
Singulair can cause alternate side effects in treated patients. Headache is the most common side effect of treatment, and was reported by approximately 18 percent of people during clinical trials for Singulair, RxList reports. Additional side effects include abdominal pain, dizziness, fatigue, skin rash, upset stomach, diarrhea or nausea. Patients who develop serious side effects, such as breathing difficulties, limb swelling, flu-like symptoms, hives, sinus pain or unusual numbness in the legs or arms, should contact a doctor immediately, according to PubMed Health.
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