Important Safety Information for Oral Enclomiphene

What is Enclomiphene?

Enclomiphene is a selective estrogen receptor modulator (SERM) used to support natural testosterone production in men with secondary hypogonadism. Unlike traditional testosterone replacement therapy (TRT), enclomiphene works by blocking estrogen receptors in the pituitary gland, which stimulates the body's own production of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). This approach helps raise testosterone levels while preserving sperm production and fertility—a significant advantage for men who wish to maintain reproductive function.

Regulatory Status

Enclomiphene is not FDA-approved as a standalone medication. While it is the active isomer of clomiphene citrate (an FDA-approved fertility drug), enclomiphene itself is available only as a compounded medication. Compounded medications have not been reviewed by the FDA for safety, effectiveness, or quality. Use only under medical supervision.

Who Should Not Use Enclomiphene?

Do not use enclomiphene if you:

• Have a known allergy to enclomiphene, clomiphene, or any component of the formulation
• Have a history of liver disease or liver dysfunction
• Have uncontrolled adrenal gland disorders
• Have uncontrolled thyroid disorders
• Have a pituitary tumor (pituitary adenoma) unless cleared by an endocrinologist
• Have a personal or family history of blood clots (deep vein thrombosis, pulmonary embolism)
• Are currently taking blood thinners without medical supervision
• Are female, pregnant, or breastfeeding (this medication is for men only)

Warnings and Precautions

1. Blood Clot Risk (Thromboembolic Events)As a selective estrogen receptor modulator (SERM), enclomiphene may be associated with an increased risk of blood clots, including deep vein thrombosis (DVT) and pulmonary embolism (PE). This risk may be higher in individuals with pre-existing risk factors such as obesity, smoking, prolonged immobility, or personal/family history of clotting disorders. Seek immediate medical attention if you experience leg pain, swelling, warmth, or redness, or if you develop sudden shortness of breath or chest pain.

2. Estrogen EffectsAlthough enclomiphene is primarily an estrogen antagonist, changes in estrogen balance may occur. Some men may experience elevated estradiol levels. Your healthcare provider should monitor hormone levels during treatment and adjust therapy as needed.

3. Liver FunctionWhile enclomiphene has not been directly linked to liver toxicity in clinical studies, SERMs as a class require caution in patients with liver conditions. Inform your provider if you have any history of liver disease.

4. Vision ChangesVisual disturbances have been reported with clomiphene citrate (the parent compound) and may potentially occur with enclomiphene. Report any changes in vision, including blurred vision, spots, flashes of light, or difficulty with night vision, to your healthcare provider immediately.

5. Mood ChangesSome individuals may experience mood changes, including depression, irritability, or mood swings. However, studies suggest these effects are less common with enclomiphene than with clomiphene citrate. Report significant mood changes to your provider.

6. Hormone MonitoringRegular blood tests are recommended to monitor testosterone, LH, FSH, estradiol, and hematocrit levels. Your provider will use these results to assess treatment effectiveness and safety.

Common Side Effects

Enclomiphene is generally well-tolerated. Side effects reported in clinical trials were mostly mild and included:

• Headache (approximately 3% of patients)
• Hot flashes
• Dizziness (approximately 1% of patients)
• Nausea
• Abdominal discomfort
• Fatigue
• Mood changes
• Acne

Most side effects are transient and tend to diminish as the body adjusts to treatment.

Less Common Side Effects

The following have been observed less frequently:

• Elevated estradiol levels
• Visual disturbances
• Difficulty sleeping
• Changes in appetite
• Weight fluctuations

Advantages Over Traditional TRT

Enclomiphene offers several potential benefits compared to exogenous testosterone therapy:

• Preserves sperm production and fertility
• Maintains natural testosterone production pathways
• Does not cause testicular atrophy
• Avoids transference risk (no gels or creams)
• May be discontinued without prolonged suppression of the hypothalamic-pituitary-gonadal axis

Treatment Duration

Enclomiphene is typically prescribed for ongoing use. Testosterone levels generally return to baseline within about one month of discontinuing the medication. Do not stop taking enclomiphene without discussing with your healthcare provider.

Drug Interactions

Inform your healthcare provider about all medications you take, including:

• Blood thinners (anticoagulants)
• Other hormone therapies
• Medications metabolized by CYP2D6
• Supplements and herbal products

Monitoring Recommendations

Your healthcare provider may recommend:

• Baseline hormone panel before starting treatment
• Follow-up blood tests at regular intervals (typically every 3-6 months)
• Assessment of symptoms and side effects at each visit
• Periodic evaluation of treatment goals and effectiveness

Storage

Store at room temperature away from moisture and light. Keep out of reach of children.

When to Contact Your Healthcare Provider

Contact your provider if you experience:

• Symptoms of blood clot (leg pain/swelling, shortness of breath, chest pain)
• Visual changes
• Significant mood changes or depression
• Persistent or severe side effects
• Any symptoms that concern you

Reporting Side Effects

You are encouraged to report negative side effects to the FDA at www.fda.gov/medwatch or call 1-800-FDA-1088.

This is a compounded medication not FDA-approved. Consult your healthcare provider for complete safety information.