- Clomiphene is a fertility drug for women that urologists also use off-label to raise testosterone in men.
- It works by blocking estrogen feedback at the brain, raising LH, FSH and natural testosterone.
- It’s a mix of two isomers; one (zuclomiphene) lingers for weeks and may cause side effects.
- Visual disturbances are a stop signal. Mood swings are also common.
Clomid is best known as a fertility pill for women, but in men it can restart or boost the body’s own testosterone production. That makes it one of the two main post cycle therapy drugs. This guide explains how it works, what the evidence shows, and its side effects.
How clomiphene works
Clomiphene blocks estrogen receptors in the hypothalamus. The brain reads this as low estrogen and responds by releasing more GnRH, then more LH and FSH from the pituitary. In women this triggers ovulation; in men it raises testosterone and sperm production.
Two isomers
Clomiphene citrate is a mix of enclomiphene (the active anti-estrogen, short-acting) and zuclomiphene (weakly estrogenic, very long-acting, with a half-life of weeks). Zuclomiphene can build up and is suspected of contributing to mood and visual side effects. Enclomiphene alone has been studied as a treatment for low testosterone.
Uses in men
Low testosterone
Studies show clomiphene raises testosterone in men with secondary hypogonadism (low LH) while preserving fertility, unlike testosterone therapy. Urologists commonly use 25 mg daily or 50 mg every other day off-label, guided by bloodwork.
Post cycle therapy
After steroids, clomiphene helps restart LH and FSH. See our PCT guide.
Side effects
- Visual disturbances: blurring, flashes or spots. Stop and see a doctor.
- Mood swings, irritability and emotional sensitivity
- Rising estradiol, as testosterone rises
- Headaches
Clomid vs Nolvadex
Both are SERMs that raise LH and FSH. Tamoxifen tends to cause fewer mood and vision problems and protects breast tissue; clomiphene has more evidence for raising testosterone in men with low levels. See our Nolvadex guide.
Legal status in Canada
Clomiphene is a prescription drug in Canada (on Health Canada’s Prescription Drug List). It isn’t a controlled substance.
Buying Clomid in Canada
We stock Zionova Clomid and Clomid Genetix Pharma, both 50 mg tablets in bottles of 50; Zionova is cheaper at the time of writing. See the PCT page for live prices.
Frequently asked questions
Does Clomid raise testosterone in men?
Yes, by raising LH and FSH. It’s used off-label for men with low testosterone who want to preserve fertility.
Why does Clomid affect vision?
Visual disturbances are a known side effect, possibly related to the long-acting zuclomiphene isomer. Stop and see a doctor if they occur.
Is Clomid better than Nolvadex for PCT?
Both work through the same mechanism; tamoxifen is often better tolerated, clomiphene has more male hypogonadism data.
Is Clomid legal in Canada?
It’s a prescription drug and not a controlled substance.
Products mentioned in this guide
This article is general information for adults in Canada, not medical advice. Talk to a doctor or pharmacist before using any prescription drug, anabolic steroid or research compound, and get bloodwork done. If you’re in crisis, call or text 9-8-8 (Suicide Crisis Helpline) any time.
