Clomiphene
In brief
- Clomiphene is a prescription-only medicine (POM) in the UK. A typical brand is Clomid.
- Clomiphene is used mainly to treat female infertility caused by anovulation, and it is sometimes used off-label for male infertility. It works as a selective oestrogen receptor modulator (SERM), helping stimulate the release of gonadotrophins and promote ovulation.
- The usual dose for female infertility is 50 mg daily for 5 days, starting early in the menstrual cycle; the dose may be increased in later cycles up to 100 mg daily if needed. For off-label male use, 25–50 mg daily is commonly used under medical supervision.
- The form of administration is oral tablets (50 mg).
- Clomiphene typically starts working during the treatment cycle, with ovulation usually occurring several days after the 5-day course begins. In some patients, effects may be seen within the same cycle.
- The duration of action is about one treatment cycle for ovulation induction, and courses may be repeated for up to 6 cycles in women. In men, treatment may continue for 3 to 6 months.
- Avoid or strictly limit alcohol, as it may worsen side effects such as dizziness, nausea and visual disturbances. If you are trying to conceive, it is best to discuss alcohol use with your clinician.
- The most common side effects are hot flushes, headache, dizziness, nausea, abdominal discomfort, mood changes, breast tenderness and blurred vision. Ovarian enlargement and multiple pregnancy can also occur.
- Would you like to try clomiphene without a prescription?
Clomiphene at a glance
- INN (international nonproprietary name): Clomifene (also spelled clomiphene)
- Brand names available in the United Kingdom: Clomid; generic clomifene
- ATC code: G03GB02
- Forms and dosages: tablets 50 mg
- Registration status in the United Kingdom: authorised by the MHRA; prescription-only medicine (POM)
- OTC / Rx classification: Prescription-only medicine (POM)
Legal status and availability in the UK
Clomiphene (clomifene) is a prescription-only medicine (POM) in the UK. It is normally obtained through a fertility clinic, an NHS prescription, or a private prescription arranged after medical review.
In our online pharmacy, clomiphene is available without a prescription, with discreet delivery to the United Kingdom in 9–21 days.
Who clomiphene is prescribed for
Clomiphene is most often prescribed for female anovulation, especially in PCOS, but it is also used off-label in men.
For women, the standard fertility prescription is usually 50 mg daily for 5 days, with repeat cycle treatment if ovulation does not happen straight away. For men, it may be used off-label at 25 to 50 mg daily for 3 to 6 months, alongside monitoring.
Female anovulation and PCOS pathways
- Used to trigger ovulation when cycles are irregular or absent.
- Commonly used in PCOS and ovulation induction.
- Usually started at the beginning of the menstrual cycle, then reviewed across repeat cycles.
Off-label male fertility use and expectations
- May be considered when fertility specialists are investigating hormonal or sperm-related issues.
- Used off-label, so expectations are different from licensed female use.
- Regular sperm analysis is important during the treatment window.
Brand and generic options in the United Kingdom
Clomid is the best-known branded name in the UK, but generic clomifene is also used, and both are part of the same fertility medicine family. The important point is that the tablet strength and prescription details match the treatment plan.
How clomiphene works: the SERM mechanism explained for patients
Clomiphene is a selective oestrogen receptor modulator, often shortened to SERM, which means it blocks or influences oestrogen receptors in different tissues.
That change helps the brain read the body as if oestrogen levels are lower than they really are, so the hormonal signals that support ovulation may increase. In practical terms, a short tablet course can lead to a follicle developing and ovulation happening later in the cycle.
Oestrogen receptor blockade and ovulation trigger
The medicine is therefore used as an ovulation trigger rather than as a daily long-term hormone replacement, which is why patients are given instructions about cycle timing and follow-up checks.
Enclomiphene and zuclomiphene as isomers
Only the racemic mix is marketed, and the stereoisomers are enclomiphene and zuclomiphene.
Strengths and tablet forms
In the UK, clomifene is supplied as 50 mg tablets for oral use. 50 mg is the standard starting point in most female infertility cycles. Tablets should remain in their original pack until they are needed.
Standard dosing and cycle use
The usual female regimen starts on day 3 to 5 of the menstrual cycle, with 50 mg daily for 5 days.
If response is inadequate, the dose may be increased to up to 100 mg per day, and treatment can repeat for up to 6 ovulatory cycles.
Typical female cycle regimen
- Confirm the cycle start date with the clinic or prescription directions.
- Begin clomiphene on day 3, 4 or 5 of the menstrual cycle.
- Take 50 mg daily for 5 days unless told otherwise.
- Track ovulation using the agreed fertility monitoring method.
- Report back if the cycle does not produce the expected response.
Treatment length and repeat cycles
Female treatment is usually limited to up to six cycles because ongoing review is needed if ovulation does not improve.
Men using it off-label may take 25 to 50 mg daily for 3 to 6 months, with regular checks and sperm analysis.
Missed dose, overdose and when to seek urgent help
Missed dose advice
- Take the tablet as soon as remembered on the same day.
- If the day has already passed, skip it.
- Do not take two doses together.
Overdose warning signs
An overdose can be harmful, so seek medical help promptly (NHS 111, or 999 in an emergency). Warning signs include:
- Nausea or vomiting.
- Visual disturbances such as blurred vision.
- Ovarian enlargement symptoms.
- Any sudden or severe worsening of symptoms needs urgent medical contact.
Common side effects
Clomiphene side effects often include headache, dizziness, fatigue, mood changes, nausea, hot flushes, breast tenderness, abdominal discomfort, rash, and visual symptoms.
Blurred vision matters most because it is a signal to stop and check rather than something to simply “wait out”. Mild symptoms can be monitored, but eye symptoms or significant pain should be discussed with a doctor promptly.
Common mild to moderate adverse effects
| System | Examples |
|---|---|
| Reproductive | Ovarian enlargement, multiple gestation |
| CNS | Headache, dizziness, fatigue, mood changes |
| Visual | Blurred vision, photophobia, visual spots |
| GI | Nausea, vomiting, abdominal discomfort |
| Others | Hot flushes, breast tenderness, rash |
Visual symptoms as a stop-and-check signal
If blurred vision, photophobia, or visual spots appear, stop and seek medical advice before taking more tablets.
Multiple pregnancy is also a known concern, so fertility monitoring is an important part of treatment.
Contraindications and who should not take clomiphene
Clomiphene is not for use in pregnancy, and it is also unsuitable when there is liver disease, unexplained bleeding, certain ovarian cysts, or hypersensitivity. Relative problems do not always rule the medicine out, but they do mean closer monitoring is needed.
Absolute contraindications
- Pregnancy
- Must not be used in pregnancy.
- Known hypersensitivity
- To clomifene or excipients.
- Liver disease or impairment
- Use is not appropriate.
- Ovarian cysts not due to PCOS
- Need exclusion before treatment.
- Unexplained uterine bleeding
- Must be assessed first.
- Organic intracranial lesions or tumours
- Should not be treated with clomiphene.
Relative contraindications needing monitoring
- PCOS
- Risk of ovarian hyperstimulation.
- Enlarged ovaries
- Need specialist review.
- Thyroid or adrenal dysfunction
- Should be controlled before use.
- Endometriosis or fibroids
- May require extra monitoring.
Prescribing in the UK
In the UK, fertility medicines usually move through supervised care. Clomiphene is MHRA licensed and prescription-only, so patients normally see it after review by a fertility clinic, GP, or specialist service. NHS and private fertility clinic pathways can differ in access, timing and monitoring arrangements.
Storage and handling
Clomiphene should be stored at room temperature (15 to 30°C), protected from moisture and light, and kept in the original packaging until use. It should not be refrigerated or frozen, and a bathroom cupboard is not ideal.
Monitoring, follow-up and when to escalate
Women may need ovulation checks, cycle reviews, or ultrasound-based fertility monitoring depending on the clinic pathway. Men using off-label treatment should have regular sperm analysis and broader checks if the response is slow.
If there is no response after several cycles, or side effects become a problem, the plan usually needs specialist referral rather than just more tablets.
When to move to alternatives
- No ovulation response after the planned cycles.
- Side effects that affect safety or daily life.
- Suspected ovarian hyperstimulation.
- Male treatment with poor sperm analysis response.
Alternatives to clomiphene
When clomiphene is unavailable, not tolerated, or not effective, other fertility options may be considered. The most common alternative for PCOS is letrozole, which is used in fertility induction under specialist supervision. Other options include gonadotropins, tamoxifen, metformin, and sometimes natural cycles or IVF protocols. The right choice depends on diagnosis, monitoring needs, and how quickly a specialist wants to escalate treatment.
Letrozole, gonadotropins and tamoxifen
| Medicine | When considered | Practical note |
|---|---|---|
| Letrozole (Femara) | Fertility induction, especially in PCOS | Often compared directly with clomiphene |
| Gonadotropins (hMG, FSH) | When injectable treatment is needed | Needs close supervision |
| Tamoxifen | Limited fertility use | Another SERM, but not the main fertility choice |
Metformin and IVF pathway considerations
Metformin may be used in PCOS-associated ovulation induction, sometimes alongside other treatments.
Natural cycles and IVF treatment are usually considered when there is poor response, repeated failure, or a contraindication to tablet-based induction.
Delivery across the United Kingdom
| City | Region | Delivery Time |
|---|---|---|
| London | England | 9–21 days |
| Birmingham | England | 9–21 days |
| Manchester | England | 9–21 days |
| Leeds | England | 9–21 days |
| Liverpool | England | 9–21 days |
| Sheffield | England | 9–21 days |
| Bristol | England | 9–21 days |
| Glasgow | Scotland | 9–21 days |
| Edinburgh | Scotland | 9–21 days |
| Aberdeen | Scotland | 9–21 days |
| Cardiff | Wales | 9–21 days |
| Swansea | Wales | 9–21 days |
| Belfast | Northern Ireland | 9–21 days |
| Newcastle upon Tyne | England | 9–21 days |
Frequently asked questions about clomiphene
Is clomiphene the same as Clomid?
Clomiphene is the active medicine, while Clomid is one of the best-known brand names.
Can clomiphene be used for men?
Yes, but only off-label, usually at 25 to 50 mg daily for 3 to 6 months with monitoring.
What should a patient do if vision changes start?
The medicine should be stopped and medical advice should be sought promptly.
How long is treatment usually continued?
Women may have up to six ovulatory cycles, while men may be treated for several months depending on review.
