Praxis Medical Insights

Est. 2024 • Clinical Guidelines Distilled

Made possible by volunteer editors from the University of Calgary & University of Alberta

Last Updated: 11/6/2025

Side Effects of Vyvanse (Lisdexamfetamine)

Common Side Effects

  • Headaches are commonly reported across all age groups 1, 2
  • Increased heart rate and blood pressure occur in most patients, though effects are typically small at the group level 1, 2
  • These cardiovascular changes may be clinically significant in patients with preexisting heart disease 2
  • Clinical guidelines recommend monitoring pulse and blood pressure regularly during treatment 2

Weight and Growth Effects in Pediatric Patients

  • Weight loss and growth suppression represent clinically significant concerns requiring careful monitoring 1, 2
  • These effects appear dose-related and require ongoing monitoring of height and weight 2

Psychiatric Effects

  • Contrary to earlier concerns, recent evidence suggests psychostimulants may actually decrease suicidal events in ADHD patients rather than increase them 1

Special Population Considerations

Pregnancy and Lactation

  • Possible small increased risk for preterm birth when use continues in second half of pregnancy (aRR 1.30; 95% CI 1.10-1.55) 3
  • Women should not breastfeed while taking Vyvanse; infants should be monitored for irritability, insomnia, and feeding difficulties if exposure occurs 3

Clinical Monitoring Requirements

  • Regular monitoring should include pulse and blood pressure at each visit 2
  • Assessment for emergence of psychiatric symptoms 2

Important Clinical Caveats

  • The therapeutic benefits for ADHD symptoms typically outweigh the side effect burden for most patients when properly monitored 1, 2