Does lisdexamfetamine cause weight loss?

Yes. Lisdexamfetamine (Vyvanse) commonly causes weight loss because it tends to decrease appetite. This effect is most noticeable in the first few weeks of treatment.

Key points:
- It’s not intended for weight loss; the weight change is a side effect.
- In children and adolescents, this can affect growth or weight gain over time, so doctors often monitor height and weight regularly.
- In adults, weight loss can still occur but is usually less pronounced over time.

What you can do (talk with the prescribing clinician about any changes):
- Take the dose in the morning with breakfast to help with appetite timing and reduce insomnia.
- Maintain a regular, balanced diet and consider higher-calorie, protein-rich snacks to maintain weight if advised.
- If weight loss is concerning or persistent, the clinician may adjust the dose, switch medications, or consider other options.
- If there are signs of poor growth in a child (e.g., consistently not gaining weight or height), contact the clinician promptly.

If you’d like, tell me your age and whether you’re asking about yourself or someone else, and I can tailor the information further.