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Clomiphene citrate is a powerful, nonsteroidal Selective Estrogen Receptor Modulator (SERM) used as a first-line, orally administered therapy for treating ovulatory dysfunction in women desiring pregnancy. It works by selectively modulating estrogen receptors to stimulate the hypothalamic–pituitary–ovarian (HPO) axis, leading to follicular growth and subsequent ovulation. Since its FDA approval in 1967, it has been widely used and is also employed off-label in men with secondary hypogonadism.
Looking for the off-label use in men? View ClomipheneReviewed by:
Dr. Steve Malen, PharmD
Dr. Steven Blikstein, PharmD
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Clomiphene citrate is a powerful, nonsteroidal Selective Estrogen Receptor Modulator (SERM) used as a first-line, orally administered therapy for treating ovulatory dysfunction in women desiring pregnancy. It works by selectively modulating estrogen receptors to stimulate the hypothalamic–pituitary–ovarian (HPO) axis, leading to follicular growth and subsequent ovulation. Since its FDA approval in 1967, it has been widely used and is also employed off-label in men with secondary hypogonadism.
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Clomiphene citrate is a nonsteroidal Selective Estrogen Receptor Modulator (SERM) first approved by the FDA in 1967. It is the first-line oral therapy for ovulatory dysfunction in women who wish to become pregnant, and remains one of the most widely prescribed fertility medications worldwide because of its low cost, oral administration, and well-established safety profile relative to injectable options.
Marketed under the brand name Clomid, it is also used off-label in men with secondary hypogonadism (low testosterone caused by reduced pituitary signaling) as an alternative to testosterone replacement that does not suppress natural sperm production.
Clomiphene citrate is indicated for the induction of ovulation in anovulatory or oligo-ovulatory women with adequate endogenous estrogen production and normal liver function who desire pregnancy. It is typically the first medication tried before moving to injectable gonadotropins or IVF.
Off-label, it is used in men with secondary (hypogonadotropic) hypogonadism to raise endogenous testosterone by increasing the body's own LH and FSH output, rather than replacing testosterone directly.
Administration & Dosage
Most prescribers have patients start on cycle day 3, 4, or 5 (day 1 is the first day of your period), taken once daily for 5 days. Follow your specific prescriber's instructions, since exact timing can vary by protocol.
Take it as soon as you remember that same day. Don't double up the next day to make up for it. If you miss more than one dose in the 5-day course, contact your prescriber before continuing.
Yes — your prescriber will typically confirm ovulation using an ovulation predictor kit, basal body temperature charting, a blood progesterone test, or ultrasound follicle tracking, especially during your first treatment cycle.
Ovulation usually occurs 5 to 10 days after your last dose. It's most commonly confirmed with a urine ovulation-predictor kit, basal body temperature charting, or a progesterone blood test roughly a week after presumed ovulation.
What to Expect
Ganirelix acetate is an injectable, synthetic decapeptide classified as a competitive gonadotropin-releasing hormone (GnRH) antagonist. It is used as a core component of assisted reproductive technologies (ART), such as in vitro fertilization (IVF), to prevent premature luteinizing hormone (LH) surges in women undergoing controlled ovarian hyperstimulation (COH). It works by competitively blocking pituitary GnRH receptors, causing an immediate and reversible suppression of gonadotropin secretion
Pharmacodynamics
Clomiphene citrate binds to estrogen receptors in the hypothalamus, blocking normal negative feedback from circulating estradiol. The hypothalamus interprets this as a low-estrogen state and increases the pulse frequency of gonadotropin-releasing hormone (GnRH), which in turn raises pituitary secretion of follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The resulting rise in FSH recruits and matures ovarian follicles, and the subsequent LH surge triggers ovulation, typically 5 to 10 days after the last dose.
Pharmacokinetics
Standard Regimen
Monitoring
Ovulation is typically confirmed with a urine ovulation-predictor kit 5–10 days after the last dose, basal body temperature charting, a mid-luteal-phase progesterone blood test, or ultrasound follicle tracking — your prescriber will tell you which method(s) they want you to use.
Common Side Effects
Visual Disturbances
Blurred vision, seeing spots, or other visual symptoms occur in a small percentage of patients and are a reason to stop the medication and contact your prescriber for an eye evaluation before continuing treatment.
Multiple Pregnancy
Because clomiphene often matures more than one follicle per cycle, the chance of twins rises to roughly 7–10% (versus about 1–2% in the general population); higher-order multiples are uncommon.
Ovarian Hyperstimulation Syndrome (OHSS)
OHSS is far less common with clomiphene than with injectable gonadotropins, but ovarian enlargement and pelvic pain should be reported to your provider.
Formal drug-drug interaction studies are limited. Clomiphene is generally not combined with other ovulation-inducing agents within the same cycle except under direct fertility-specialist supervision. Because it is hepatically metabolized, use with caution in patients with liver disease. A pregnancy test confirming a negative result is required before starting each new treatment cycle.
Contraindications
Lactation
Clomiphene can reduce milk supply and is generally not recommended during breastfeeding; discuss timing with your provider if you are nursing.
About 80% of women ovulate on clomiphene, most within the first 3 treatment cycles, though ovulating doesn't guarantee immediate pregnancy. Most successful pregnancies happen within the first 3 to 6 ovulatory cycles.
Yes, modestly — clomiphene raises the chance of twins to roughly 7–10%, compared to about 1–2% in the general population, because it often matures more than one follicle per cycle. Higher-order multiples (triplets or more) are uncommon.
Safety
Hot flashes, breast tenderness, mood changes, and bloating are common and usually mild. Blurred vision or seeing spots is less common but should prompt you to stop the medication and call your prescriber before your next dose.
Yes, off-label — clomiphene is used in men with secondary hypogonadism (low testosterone from reduced pituitary signaling) to raise the body's own LH and FSH, which increases natural testosterone production without shutting down sperm production the way testosterone replacement therapy can.
Most prescribers cap cumulative use at around 6 treatment cycles. If pregnancy hasn't occurred by then, your provider will typically reassess and discuss other fertility options with you.
No — a negative pregnancy test is required before starting each new treatment cycle. Clomid is contraindicated once pregnancy is confirmed.
