PT-141 Side Effects
Medically reviewed by Dr. Jonathan Snipes, MD
Reviewed for clinical accuracy · Last reviewed July 22, 2026 · Review policy
Quick answer
The most common PT-141 side effects are nausea, flushing and injection-site reactions, and are usually mild and dose-related. Serious effects are less common; the full breakdown and cautions are below.
| Effect | Frequency |
|---|---|
| NauseaThe most common effect; can be significant | Common |
| Flushing | Common |
| Injection-site reactions | Common |
| Headache | Less common |
| Transient increase in blood pressureContraindicated in uncontrolled hypertension or known cardiovascular disease | Less common |
| Focal skin hyperpigmentationMore likely with repeated dosing | Rare |
Nausea is the standout side effect of PT-141 and the most common reason people stop it. Flushing and injection-site reactions are also frequent. Clinically important is a transient rise in blood pressure with a fall in heart rate after each dose, which is why it is not recommended for people with uncontrolled hypertension or known cardiovascular disease. Repeated use can cause focal darkening of the skin.
Frequently asked questions
What are the most common PT-141 side effects?+
The most common PT-141 side effects are nausea, flushing and injection-site reactions. See the full frequency table above for less common and rare effects.
Is PT-141 safe?+
PT-141 is FDA-approved and, used under medical supervision, is generally tolerated, but it is not risk-free: it has side effects and specific contraindications. Discuss your history with a clinician.