Does Vyvanse Cause Increased Sweating?
Yes, Vyvanse (lisdexamfetamine) can cause increased sweating, particularly in cases of misuse or abuse, though it is not commonly reported as a side effect at therapeutic doses.
Sweating in Context of Misuse/Abuse
The FDA drug label explicitly states that misuse and abuse of lisdexamfetamine may cause sweating along with other sympathomimetic effects including increased heart rate, respiratory rate, blood pressure, dilated pupils, hyperactivity, restlessness, insomnia, decreased appetite, tremors, flushed skin, vomiting, and abdominal pain 1. This occurs because lisdexamfetamine is a prodrug that converts to d-amphetamine, which has potent sympathomimetic properties.
Sweating at Therapeutic Doses
At prescribed therapeutic doses, sweating is not listed among the most common adverse events in clinical trials or FDA labeling. The most frequently reported side effects in controlled studies include:
- Dry mouth
- Decreased appetite
- Insomnia
- Headache
- Abdominal pain
- Irritability
Historical data on stimulants as a class show that the most common side effects reported in controlled trials are sleep delay, reduced appetite, stomachache, headache, and jitteriness—with no consistent mention of sweating as a prominent therapeutic-dose side effect 4.
Clinical Context
The presence of sweating should prompt evaluation for:
- Dose appropriateness: Higher doses increase sympathomimetic effects
- Misuse or abuse: Sweating is specifically associated with non-therapeutic use patterns
- Overdose: Sweating is part of the sympathomimetic toxidrome seen in CNS stimulant overdose 1
- Individual sensitivity: Some patients may experience more pronounced sympathomimetic effects even at therapeutic doses
Practical Management
If a patient on therapeutic Vyvanse reports problematic sweating:
- Verify the prescribed dose and actual intake
- Rule out misuse, diversion, or dose escalation
- Consider dose reduction if other sympathomimetic effects are present
- Evaluate for other causes of hyperhidrosis
- Monitor vital signs, particularly heart rate and blood pressure
The distinction between therapeutic use and misuse/abuse is critical, as sweating is prominently featured in the abuse profile but not in the standard adverse event profile at recommended doses.