Contraindications to Progesterone Therapy

Absolute Contraindications

• The American College of Obstetricians and Gynecologists notes that micronized progesterone formulations contain peanut oil and should never be used in patients with peanut allergies, but vaginal gel formulations can be used as an alternative in these patients 1
• The National Comprehensive Cancer Network guidelines state that known, suspected, or history of breast cancer, including hormone receptor-positive breast cancers, is an absolute contraindication to progesterone therapy 2, 3, 4, 5
• The National Comprehensive Cancer Network guidelines also identify active arterial thromboembolic disease, such as stroke or myocardial infarction, or history of these conditions, as an absolute contraindication to progesterone therapy 2, 3, 4, 5

Relative Contraindications and High-Risk Situations

• The National Comprehensive Cancer Network guidelines recommend careful consideration of patient-specific factors, including active smoking, particularly when combined with other cardiovascular risk factors, when prescribing progestin-based therapy 2, 3, 4, 5

Important Clinical Caveats

• The National Comprehensive Cancer Network guidelines suggest that endometrial cancer patients receiving fertility-sparing progestin therapy require endometrial sampling every 3-6 months to monitor for progression 2, 3, 4, 5
• Cancer survivors often have treatment-related complications and increased metabolic syndrome risk, requiring particularly careful assessment of contraindications, according to Blood Reviews 6
• Transdermal 17β-estradiol-based preparations are preferred over oral formulations in young women with iatrogenic premature ovarian insufficiency who have cardiovascular risk factors, as they avoid first-pass hepatic metabolism, as noted in Blood Reviews 6
• Micronized progesterone has improved bioavailability and fewer reported side effects compared to synthetic progestins, but the peanut oil excipient remains an absolute contraindication in severe peanut allergy, according to the American Journal of Obstetrics and Gynecology 1

Monitoring Requirements

• The National Comprehensive Cancer Network guidelines recommend endometrial sampling every 3-6 months for patients receiving progestin monotherapy for endometrial conditions 2, 3, 4, 5
• Systematic assessment of disease-related metabolic profile and strength of contraindication is necessary before initiating therapy, as suggested in Blood Reviews 6

Micronized Progesterone Contraindications

Contraindications and Safety Considerations

• The American College of Obstetricians and Gynecologists notes that micronized progesterone is contraindicated in patients with severe peanut allergies, as many formulations contain peanut oil in the excipients, and in patients with hormone receptor-positive cancers 7