Physicians may prescribe lisdexamfetamine dimesylate for people---children and adults---with attention deficit/hyperactivity disorder (ADHD). Known by the U.S. brand name Vyvanse, the medication works as a stimulant to the central nervous system. Like other such stimulants, Vyvanse functions in the body to focus the attention of the ADHD sufferer while helping to decrease the sense of restlessness that many sufferers feel. The Mayo Clinic states this type of medicine works alongside psychological, educational and social treatments. No serious side effects of Vyvanse commonly occur in people taking it, although less commonly they may experience uncontrollable body motions and vocal outbursts, the Mayo Clinic reports.
Diarrhea and Constipation
Vyvanse may induce adjustment period non-serious common side effects such as diarrhea and constipation, Drugs.com reports. This medicine, as well as many newly introduced into a patient, can cause abdominal cramps that indicate either loose stools and an urgent need to defecate, or hardened stools that make it difficult to have a bowel movement. Contacting a doctor is suggested only if these side effects continue or become severe.
Trouble Sleeping
Stimulants of any sort, including Vyvanse, can interfere with sleep patterns. Primarily when a person starts using the medicine, he may have difficulty sleeping. The Mayo Clinic website states this problem usually does not require medical attention. Insomnia often ends as the person's body acclimates to Vyvanse.
Nausea
Vyvanse can produce a decrease in or loss of appetite for the person taking it for the first time. The person may not feel able to eat as much as usual or at all. Nausea and vomiting also may occur because of the initial ingestion of this medicine, which may compound the appetite loss. If the problems continue, the person may experience another common and non-serious side effect of the drug, unintended loss of weight. Drugs.com recommends physician consultation if the problems persist or appear severe.
Nervousness
Vyvanse, like most stimulants, can cause some psychological side effects classified as non-serious and common, Drugs.com indicates. The medication may make users feel restless or nervous. They also may feel irritable. For the most part, these temporary side effects will occur as mild problems, Drugs.com states. They, too, should cease as the person acclimates to Vyvanse.
Dry Mouth and Headaches
Dry mouth, a sensation similar to having cotton in the mouth, may occur as a non-serious common side effect of this medication. It happens because the production of saliva temporary decreases. The person also may experience headaches during the first part of Vyvanse treatment, according to the Mayo Clinic website.
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