The short answer
- Both are SERMs and both restart LH and FSH the same way. For most people either one alone is enough.
- Nolvadex (tamoxifen) is usually better tolerated, and it also treats gynecomastia.
- Clomid (clomiphene) has more clinical data for raising testosterone in men, but more mood and vision side effects.
- Running both together is common after long or heavy cycles, but the extra benefit is unproven.
“Nolvadex or Clomid?” is the most common PCT question. Both medicines are selective estrogen receptor modulators, both are cheap and widely available, and both are used for the same job: getting your natural testosterone back after a cycle. The differences are in side effects, evidence and extras. This guide puts them side by side.
Side-by-side comparison
| Nolvadex (tamoxifen) | Clomid (clomiphene) | |
|---|---|---|
| Drug class | SERM | SERM (a mix of enclomiphene and zuclomiphene) |
| How it restarts the HPTA | Blocks estrogen feedback at the hypothalamus and pituitary, raising LH and FSH | Same |
| Typical PCT dose | 40/40/20/20 mg a day, or 20 mg a day | 50/50/25/25 mg a day, or 25 mg a day |
| Half-life | About 5 to 7 days | About 5 days. The zuclomiphene part lasts weeks. |
| Evidence in men | Good: raises LH and testosterone at 20 mg a day | Strongest: many studies in secondary hypogonadism |
| Common side effects | Hot flushes, mild nausea | Mood swings, irritability, headaches |
| Serious risks | Blood clots (rare) | Visual disturbances (stop at once). Blood clots are rare. |
| Treats gynecomastia | Yes, for early, tender gyno | Not reliably |
| Effect on IGF-1 | Lowers it slightly | Little effect |
| Main interactions | CYP2D6 blockers (fluoxetine, paroxetine, bupropion), warfarin | Few that matter |
Effectiveness: which raises testosterone more?
Both drugs raise LH, FSH and testosterone in men whose HPTA is suppressed. Clomiphene has the larger body of clinical research in male hypogonadism. Tamoxifen at 20 mg a day has also been shown to raise LH and testosterone substantially, and some comparisons found it at least as potent per milligram. Head-to-head studies in people coming off anabolic steroids are small, so no one can say with confidence that one recovers people faster.
In practice, the best SERM is usually the one you tolerate well enough to finish the full course, at the right time.
Side effects: where they really differ
Nolvadex
Most people notice little at PCT doses. The thing to respect is the small risk of blood clots, which is higher in smokers, after long flights, with a high haematocrit after a cycle, or with a family history of clots.
Clomid
Mood effects are common: feeling emotional, irritable or flat. They are mostly blamed on zuclomiphene, the long-lasting isomer. Visual disturbances such as blurring, flashes or floaters are less common but mean you must stop. Lower doses (25 mg) reduce both.
Which should you choose?
- Short or moderate testosterone-only cycle: one SERM is enough. Tamoxifen is the more comfortable choice for most people.
- Signs of gynecomastia: tamoxifen, because it treats both.
- Clot risk (personal or family history, smoking, high haematocrit): talk to a doctor first. Clomiphene or enclomiphene may be preferred, but every SERM carries some risk.
- Taking fluoxetine, paroxetine or bupropion: these weaken tamoxifen, so clomiphene is the more reliable choice.
- History of mood problems, or a bad experience on Clomid: tamoxifen or enclomiphene.
- Long, high-dose or nandrolone-based cycle: many protocols combine the two for four weeks. A single SERM plus HCG beforehand is a common alternative.
Running Nolvadex and Clomid together
The classic combined PCT is tamoxifen 40/40/20/20 mg plus clomiphene 50/50/25/25 mg a day for four weeks. The argument is that the two SERMs act slightly differently, so together they give a stronger signal. The counter-argument is that both act on the same receptor, and the combination brings both drugs’ side effects. If you do combine them, keep each at the standard dose rather than raising either.
The real test is bloodwork, whichever you choose: total testosterone, LH, FSH and estradiol 4 to 6 weeks after your last tablet. See How to do PCT for the full panel.
Shop both
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Clomifene
Price range: $4.12 through $16.76 Select options This product has multiple variants. The options may be chosen on the product page -
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Clomifene
Price range: $2.00 through $2.80 Select options This product has multiple variants. The options may be chosen on the product page -
Tamoxifen
Price range: $1.60 through $2.40 Select options This product has multiple variants. The options may be chosen on the product page
Read more: Nolvadex PCT guide · Clomid PCT guide · All PCT products
Medical disclaimer. This article is general information, not medical advice. The medicines it discusses are prescription-only in most countries and are used off-label for post cycle therapy. Talk to a doctor before starting, stopping or changing any medicine, get bloodwork done, and seek medical help straight away for chest pain, shortness of breath, leg swelling or changes in your vision.
