A Pharmacokinetic Evaluation of Bioidentical Compounded Estrogen Cream and Natural Progesterone

This study is designed as a Phase I, blinded, randomized, four-arm clinical trial. Participants will be randomized to one of the four interventions: Biest transdermal cream 2.0 mg/0.5 g daily, Biest 2.5 mg/0.5 g daily, Biest 3.0 mg/0.5 g daily or Vivelle-Dot patch 0.05 mg/24 hours changed biweekly. Serum levels of E1, E2, E3 and progesterone will be obtained at baseline before starting the intervention and then multiple times on days 1 15 and 16 of study, as outlined in the table below (Table 3.1). The peak and steady state concentrations of E1, E2 and E3, along with time to reach the peak levels, and area under the curve will be calculated. Baseline and steady state levels of progesterone will also be compared between the compounded and micronized progesterone groups. If there are abnormalities in estrogen levels or symptoms suggesting such, a vaginal ultrasound would be done to exclude possible ovarian activity as a source.

Inclusion criteria

• Women 40-60 years old;
• Postmenopausal status, as documented by absence of periods for ≥ 1 year or amenorrhea for ≥ 6 months along with FSH ≥ 40 IU/L;
• Surgical menopause;
• History of a normal mammogram within the last 11 months;
• Normal screening labs (within 20% of upper limit of lab normal);
• Able to understand and sign informed consent; and
• Able and willing to be in a monitored CRU setting and provide blood samples as requested.

Exclusion criteria

• Contraindications to the use of hormones because of personal history of coronary artery disease, stroke, breast cancer, DVT/PE, active liver or gall bladder disease, hormone dependent migraine headaches, endometrial, ovarian or other hormone dependent cancers;
• Medical conditions increasing the risk of complications from hormone replacement such as uncontrolled hypertension (>160/100 mmHg), smoking, diabetes and lupus;
• Current use of estrogen, progesterone or testosterone;Depending on the drug, it could be 7 days to 6 months.
• Current use of isoflavone containing products;
• Current use of protein binding medications like rifampin, warfarin, antiepileptic drugs (effect on estrogen bioavailability);
• Family history of premenopausal breast cancer in a first degree relative, two or more premenopausal breast cancers in second degree relatives, male breast cancer, ovarian cancer in two or more relatives and; and
• Women with alcohol or substance abuse or dementia (compliance issues).
• Women who are more than ten years from their last menstrual period (unfavorable risk : benefit ratio)
• Women with peanut allergy (Prometrium has peanut oil)
• Women who are found to have premenopausal estrogen levels, as confirmed by a baseline Estradiol level of >35 pg/ml and vaginal ultrasound suggesting ovarian activity.