What are the contraindications for micronized progesterone?

Contraindications for Micronized Progesterone

Micronized progesterone has very few absolute contraindications, with severe peanut allergy (anaphylaxis) being the primary concern due to peanut oil in most oral formulations, though vaginal gel alternatives without peanut oil exist. 1

Absolute Contraindications

Severe Peanut Allergy

• Most oral micronized progesterone capsules contain peanut oil as an excipient 1
• Individuals with anaphylactic reactions to peanuts should not receive these formulations 2
• Alternative: Vaginal progesterone gel formulations do not contain peanut oil and can be safely used 2

Important Context: Progesterone vs Combined Estrogen-Progestin

The evidence provided focuses heavily on combined estrogen-progestin contraception, which has different contraindications than progesterone-only therapy. This distinction is critical:

Combined Estrogen-Progestin (NOT applicable to progesterone alone):

• Formally contraindicated in personal history of venous thromboembolism 3
• Formally contraindicated in personal history of arterial events (coronary disease, stroke) 3
• Relative contraindication with documented thrombophilia 3
• Relative contraindication with family history of thromboembolism before age 60 3

Progesterone-Only Therapy:

• Can be considered even in women with thrombotic history where combined therapy is contraindicated 3
• Shows one of the best safety profiles regarding thrombotic risk 4
• Minimizes cardiovascular risks compared to synthetic progestogens 4

Safety Profile Advantages

Micronized progesterone demonstrates superior safety compared to synthetic progestins:

• Neutral or beneficial effect on blood pressure 4
• No significant adverse effects on lipid profiles, coagulation factors, or blood pressure 5
• Minimal metabolic side effects 6
• Lower breast cancer risk compared to synthetic progestins 6
• Reduced venous thromboembolism risk compared to synthetic alternatives 6

Common Side Effects (Not Contraindications)

• Mild, transient drowsiness (minimized by bedtime dosing) 7
• Dizziness 6
• Premenstrual-tension-like symptoms possible but less common than with synthetic progestins 8

Clinical Pitfalls to Avoid

1. Do not confuse progesterone-only contraindications with combined estrogen-progestin contraindications - they have vastly different risk profiles
2. Always screen for peanut allergy before prescribing oral micronized progesterone 2, 1
3. Consider vaginal formulations for patients with peanut allergy or those experiencing drowsiness with oral administration 2
4. Hepatic or renal insufficiency effects have not been studied, though no specific contraindications are established 1