Hello,
Fever is a known side effect of Vyvanse, but it is not very common. In your case, with the muscle aches, chills, and fever, I would suspect that you have an acute illness.
From the sound of it, I would suspect
influenza or some other viral illness. If you develop
severe muscle pain,
prolonged fever for more than a few days, or other severe symptoms such as
severe nausea and vomiting, are unable to keep down any food or liquids, or for any
disorientation or altered mental status, I would seek medical attention.
Otherwise, I think you can wait to see how the illness progresses and hopefully, after a few days, you'll be feeling better.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Aaron Branch,
General & Family Physician