Low Testosterone · Medication Guide
Testosterone Injections in Thailand
What injectable testosterone is, how well it works, its side effects, and how men in Bangkok get it legally and safely. It is a monitored treatment for diagnosed testosterone deficiency, not a shortcut for men with normal levels. Reviewed by a licensed physician at a MOPH-registered men's health clinic.
- For diagnosed low testosterone
- Prescription only · given in clinic
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Medically reviewed by Dr. Noppon Arunkajohnsak (Win)
Menscape Clinic
Last reviewed
11 July 2026
1979
Injectable testosterone approved
cypionate ester, decades of clinical use
10–14
Weeks between long-acting shots
undecanoate maintenance, after loading doses
54%
Hematocrit safety ceiling
guidelines pause therapy above it
2×
Morning tests to confirm
low testosterone measured before starting
Key takeaways
Injectable testosterone is a prescription treatment for diagnosed testosterone deficiency (male hypogonadism), not a shortcut for men whose levels are normal.
It is an ester injected into muscle, from short-acting shots every 1–2 weeks to long-acting ones every 10–14 weeks, and is only started once low testosterone is confirmed on two morning blood tests.
As an anabolic-androgenic steroid it is prescription-controlled worldwide; it suppresses fertility, can raise red-blood-cell counts and needs regular bloodwork, never gym or grey-market dosing.
Unlike the gel it carries no skin-transfer risk, but levels can swing between shots, so a doctor weighs which form suits you and monitors hematocrit and PSA throughout.
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What testosterone injections are & how they work
Testosterone is the main male sex hormone. When the body makes too little of it, a condition called male hypogonadism or testosterone deficiency, men can experience low libido, fatigue, low mood and loss of muscle. Injectable testosterone treats this by replacing the missing hormone directly, on a schedule set by a doctor.
The testosterone is attached to an ester and injected into muscle, where it is released slowly into the bloodstream. Short-acting esters such as enanthate or cypionate are given every 1–2 weeks, while long-acting undecanoate is given roughly every 10–14 weeks after the loading doses. Levels peak in the days after a shot and taper before the next one, so the aim is to keep testosterone in the normal adult male range across the cycle.¹²
It is replacement, not enhancement. It is only appropriate when blood tests confirm genuinely low testosterone together with symptoms; taking it with normal levels offers no benefit and carries the same risks. Whether it suits you, and which ester and interval, depends on your bloods, symptoms, fertility plans and health history, which is what the doctor's assessment is for.³
The body runs low
The testes produce too little testosterone, causing low libido, fatigue, low mood or loss of muscle.
An ester is injected into muscle
Testosterone bound to an ester is injected and released slowly over days to weeks.¹
Levels rise, then taper
Serum testosterone returns to the normal male range, peaking after the shot and tapering before the next.²
Symptoms ease over time
Libido and mood often improve within weeks; muscle and fat changes take 3–6 months.⁴
02
Getting testosterone injections in Thailand
Thai FDA status
Injectable testosterone is a registered prescription medicine in Thailand, dispensed only through licensed channels. As an anabolic-androgenic steroid it is a controlled substance in many countries (Schedule III in the United States), which is why it stays prescription-controlled and monitored here too. It is sold in Thailand under brands such as Sustanon and Nebido.⁵⁶
How to get it through Menscape
Testosterone injections are given as part of a monitored TRT program, not handed over at a pharmacy counter. A licensed physician first confirms deficiency from your twice-measured morning bloods and symptoms; if it is suitable, the injection is administered and scheduled in clinic at Asoke, with follow-up bloodwork built into the plan.
Safety vs the grey market
Gyms, online sellers and grey-market 'TRT' shops inject testosterone and steroids with no diagnosis and no monitoring. That is illegal, the vials are often counterfeit or wrongly dosed, and unmonitored use risks blood clots, infertility and worse.
Thai FDA warning. Buying or injecting hormones and steroids sourced from unlicensed sellers is illegal and unsafe. Counterfeit and mislabelled vials are common, and no one is accountable for what you receive.⁷
03
Does it work? The evidence
Testosterone replacement has been used clinically for decades, and injectable esters have been FDA-approved since 1979. In men with confirmed low testosterone, restoring levels to the normal range reliably improves the symptoms of deficiency, though the size and speed of improvement vary from symptom to symptom.¹³
Timelines differ. In pooled clinical data, libido and mood tend to respond within 3–6 weeks, while erectile function and body composition improve more slowly, over 3–6 months and sometimes up to a year, and effects on bone density take longer still. The benefit only holds while levels stay in range: after a short-acting shot, testosterone falls back toward baseline over the following days to weeks.⁴
3–6 wk
Libido and mood
typical time to first improvement
3–6 mo
Body composition
muscle and fat changes take longer
Based on pooled clinical data in men with confirmed hypogonadism. Testosterone replacement treats deficiency; it is not a treatment for men with normal levels. Individual results vary.⁴
04
Side effects & who shouldn't take it
Common side effects
Soreness, redness or bruising at the injection site, acne and oilier skin. Some men notice mood or energy swings as levels peak and dip between shots, especially with short-acting esters, plus mild fluid retention or breast tenderness.¹
Serious but less common
Testosterone can raise red-blood-cell counts (polycythemia), which increases clot risk, and can worsen sleep apnea. It suppresses sperm production, shrinking the testicles and reducing fertility while used. Long-acting injections carry a rare risk of pulmonary oil microembolism, a cough or breathlessness right after the shot.²
Who shouldn't use it
Men with known or suspected prostate or breast cancer, a high hematocrit, untreated severe sleep apnea, uncontrolled heart failure, or who are actively trying to conceive. It is never for women or children.¹³
Monitoring is not optional
Bloods (testosterone, hematocrit, PSA) are checked before starting, at 3–6 months, then yearly. Guidelines pause therapy if hematocrit rises above 54%. Tell any doctor who tests your prostate that you are on testosterone.³
05
Alternatives & combinations
Transdermal · daily
Testosterone gel
A daily 1% gel absorbed through the skin gives steadier levels and is easy to adjust, but it can transfer to partners or children on skin contact. A doctor weighs it against injections; it is covered in our testosterone gel guide.
Long-acting · other routes
Pellets & skin patches
Testosterone also comes as pellets implanted under the skin every few months and as skin patches. Each trades off convenience, steadiness of levels and side-effect profile against injections.
Fertility-sparing
Clomiphene, hCG or enclomiphene
Because injected testosterone suppresses sperm production, men who want to preserve fertility may instead discuss options that raise the body's own testosterone, such as clomiphene, hCG or enclomiphene, with their doctor.
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How prescription works at Menscape
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Message us on WhatsApp or LINE
A few minutes on your phone: your symptoms, health history and current medications. It is confidential and PDPA-protected.
Blood tests & consultation
A licensed Thai physician reviews your morning testosterone results, measured twice, and your symptoms, at the Asoke clinic or by video call.
First injection, if suitable
If deficiency is confirmed and treatment is appropriate, the doctor prescribes and gives the injection in clinic, explains the technique and sets your schedule.
Follow-up & monitoring
Repeat bloods (testosterone, hematocrit, PSA) and symptom check-ins keep the dose and interval right and safe over time.
The doctor decides. Starting a conversation is not a commitment and does not guarantee treatment. Testosterone is only prescribed when blood tests and symptoms confirm a genuine deficiency.
Medically reviewed by
Dr. Noppon Arunkajohnsak (Win)
Menscape Clinic, Bangkok
“Injected testosterone is a long-term commitment, not a quick fix. I only start a man once the bloods are clear, and I keep checking his hematocrit and prostate for as long as he stays on it.”
- Reviewed
- 11 July 2026
- Next review
- January 2027
- Editorial standard
- Each guide is checked against the Thai FDA label and the primary literature, then reviewed by a licensed physician.
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Frequently asked questions
Can I buy testosterone injections over the counter in Thailand?
No. Injectable testosterone is a prescription-only medicine and, as an anabolic-androgenic steroid, a controlled substance. It must be prescribed by a doctor and given or dispensed through licensed channels after your diagnosis is confirmed. Gym and online sellers are illegal and a real counterfeit risk.
Gel or injection, which is better?
Neither is universally better. Injections are less frequent and carry no skin-transfer risk, but levels rise and fall between doses. The gel gives steadier daily levels and is easy to adjust, though it can transfer to others. Your doctor helps you choose based on your bloods and lifestyle.
How often would I need injections?
It depends on the ester. Short-acting testosterone such as enanthate or cypionate is usually injected every 1–2 weeks, while long-acting undecanoate is given roughly every 10–14 weeks after the initial loading doses. Your doctor picks the interval that keeps your levels in range.
Will testosterone injections affect my fertility?
Yes. Injected testosterone suppresses your body's own sperm production and can shrink the testicles while you use it, sometimes to the point of azoospermia. If you are planning a family, tell your doctor, because fertility-sparing alternatives exist.
Do I need blood tests while I'm on it?
Yes. Testosterone can raise your red-blood-cell count and affects the prostate, so a doctor monitors testosterone, hematocrit and PSA with periodic bloods. Guidelines pause treatment if hematocrit rises above 54%. Monitoring is a core part of safe treatment, not an optional extra.
Is testosterone treatment safe for my heart?
It has to be handled carefully. Testosterone raises red-blood-cell counts, which can increase clot risk, and the evidence on cardiovascular events is still debated. A doctor screens your heart health first and monitors you throughout; it is not used in uncontrolled heart failure.
Can I just get a testosterone shot at a gym or wellness shop?
No, and it is genuinely risky. Those settings inject with no diagnosis, no bloodwork and often counterfeit or wrongly dosed vials. Unmonitored testosterone can cause dangerous red-cell thickening, clots and lasting infertility. It belongs in a monitored medical program.
I already get TRT injections abroad, can I continue in Thailand?
Usually yes. Bring your prescription and recent blood results, and a licensed doctor here can review your treatment, confirm it is still appropriate and continue it under monitoring.
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References
1. U.S. FDA. Depo-Testosterone (testosterone cypionate) injection prescribing information. Pfizer. Accessed July 2026.
2. U.S. FDA. Aveed (testosterone undecanoate) injection prescribing information, including pulmonary oil microembolism warning. Endo Pharmaceuticals. Accessed July 2026.
3. Bhasin S, et al. Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2018;103(5):1715-1744.
4. Saad F, et al. Onset of effects of testosterone treatment and time span until maximum effects are achieved. Eur J Endocrinol. 2011;165(5):675-685.
5. Thai Food and Drug Administration — drug registration database, ndi.fda.moph.go.th. Accessed July 2026.
6. European Medicines Agency. Nebido (testosterone undecanoate) product information. Accessed July 2026.
7. Thai FDA consumer warnings on purchasing medicines and steroids from unlicensed sellers, oryor.com. Accessed July 2026.
This guide is educational information, not medical advice. Injectable testosterone is a prescription-only medicine that must be diagnosed, prescribed, administered and monitored by a licensed physician.
This guide is part of the Menscape hormone library
Book a consultationThink your testosterone is low? Get tested, not a gym vial.
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