No Clinically Significant Drug Interaction Between Vyvanse and Progesterone
There is no documented pharmacokinetic or pharmacodynamic interaction between lisdexamfetamine (Vyvanse) and progesterone, and these medications can be used together safely.
Evidence Base
The available evidence does not identify any interaction between these two medications:
Pharmacological Mechanisms
Lisdexamfetamine is a prodrug converted to dextroamphetamine by erythrocyte cells after ingestion 1. It primarily affects dopamine and norepinephrine neurotransmission and has minimal hepatic metabolism initially.
Progesterone is metabolized primarily by the liver through cytochrome P450 enzymes, particularly CYP3A4, and is converted to pregnanediols and pregnanolones 2. Recent research shows progesterone inhibits CYP2C9 and CYP2C11 3, but these pathways are not involved in amphetamine metabolism.
Research Findings
A 2019 study examining lisdexamfetamine's effects on steroid hormones found that lisdexamfetamine increased endogenous progesterone levels in men through HPA axis stimulation 4. However, this represents a physiological response rather than a drug-drug interaction, and progesterone levels increased by only modest amounts as part of the stress hormone response—this does not indicate that exogenous progesterone administration would interact with lisdexamfetamine.
Clinical Context
The 2024 AJOG guidelines on ADHD management during pregnancy extensively discuss lisdexamfetamine use in women who may be taking progesterone (for contraception, hormone replacement, or pregnancy support) without mentioning any interaction concerns 1. The FDA label for progesterone lists multiple drug interactions but does not include amphetamines or stimulant medications 2.
Clinical Implications
You can prescribe or continue both medications simultaneously without dose adjustments. The only monitoring needed relates to the individual side effects of each medication:
- For lisdexamfetamine: Monitor for cardiovascular effects, appetite suppression, insomnia, and potential for misuse 1, 5
- For progesterone: Monitor for drowsiness (especially when initiating therapy), mood changes, and breakthrough bleeding 2
Important Caveat
If progesterone is being used in pregnancy, be aware that lisdexamfetamine crosses the placenta and may carry small risks for preterm birth (aRR 1.30), preeclampsia (aRR 1.29), and possibly gastroschisis, though absolute risks remain low 1. One case report documented successful use during pregnancy and breastfeeding without significant infant effects 6, though data remains limited.
The combination is safe from an interaction standpoint, but pregnancy-specific risks of lisdexamfetamine should be discussed separately with patients of childbearing potential.