In Summary. Common side effects of Vyvanse include: insomnia and irritability. Other side effects include: dizziness, weight loss, and xerostomia. See below for a comprehensive list of adverse effects. For the Consumer. Applies to lisdexamfetamine: oral capsule.
Examples of involuntary weight loss include the weight loss associated with cancer, malabsorption (such as from chronic diarrheal illnesses), and chronic inflammation (such as with rheumatoid arthritis).eight loss: Weight loss is a decrease in body weight resulting from either voluntary (diet, exercise) or involuntary (illness) circumstances.
Less common causes of unexpected weight loss. Less frequently, unexpected weight loss may be the result of: 1  the side effects of certain medications. 2  alcohol misuse or drug misuse. 3  heart, kidney, lung or liver disease. 4  a problem with the glands that secrete hormones, such as Addison's disease or undiagnosed diabetes.