Testosterone clearance time is about 2 to 3 days to several weeks or months, depending on the formulation. Reviewed: ****.
Testosterone gel usually brings blood levels close to baseline within 48 to 72 hours after the last dose. Testosterone cypionate injections have an approximate 8-day half-life, so one injection may take about 5 to 6 weeks to be mostly eliminated. Long-acting testosterone undecanoate injections can keep testosterone levels elevated for about 10 weeks.
Testosterone Clearance by Formulation
| Testosterone type | How long it may remain active |
|---|---|
| Testosterone gel | Blood levels for AndroGel 1.62% generally return close to baseline within 48 to 72 hours after the last application. Some products may take about 5 days. |
| Testosterone cypionate injection | The half-life is approximately 8 days. About 40 days may be needed for most of a single dose to be eliminated, although results vary. |
| Testosterone enanthate injection | It usually lasts longer than natural testosterone because the ester releases testosterone over time. Clearance depends on the product and dose. |
| Testosterone undecanoate injection, such as Aveed | After steady state is reached, it can keep average testosterone levels in the normal range for about 10 weeks. |
| Oral testosterone undecanoate | The testosterone undecanoate component has an elimination half-life of about 2 hours. The dosing schedule and repeated use affect total exposure. |
Why Testosterone Injections Last Longer Than Testosterone Itself
Free testosterone in the bloodstream has a short half-life. Product labeling reports it as approximately 10 to 100 minutes. Injectable testosterone is attached to an ester, such as cypionate, enanthate or undecanoate. The ester stays at the injection site and releases testosterone over time before the body converts it into active testosterone.
The formulation, rather than testosterone alone, determines how long the medication remains in the body.
How the Half-Life Affects Clearance
A half-life is the time needed for the amount of a drug in the body to fall by half. With testosterone cypionate, which has an approximate 8-day half-life:
- After 8 days, about 50% remains.
- After 16 days, about 25% remains.
- After 24 days, about 12.5% remains.
- After 32 days, about 6.25% remains.
- After about 40 days, about 3% remains.
This is a rough estimate. Repeated injections, higher doses and differences in metabolism can affect how long testosterone remains measurable or continues to have an effect.
How Long Does Testosterone Stay Detectable?
There is no single detection window for testosterone. The answer depends on:
- The test used
- The formulation
- The dose and frequency of use
- Whether the test measures testosterone, an ester or a metabolite
- Individual metabolism
- Whether the testosterone was prescribed or used at performance-enhancing doses
A standard workplace drug test usually does not test for testosterone. U.S. Department of Transportation tests are limited to marijuana, cocaine, amphetamines, opioids and PCP.
Sports testing works differently. The World Anti-Doping Agency can assess testosterone-related markers and use isotope-ratio mass spectrometry to distinguish naturally produced testosterone from testosterone given from an outside source. No universal number of days guarantees a negative result for every athlete.
Can Testosterone Effects Last After the Drug Is Gone?
Yes. Testosterone levels can return to a lower range before the effects of treatment or misuse have ended.
Testosterone from outside the body can suppress natural testosterone production, luteinizing hormone and follicle-stimulating hormone. After prolonged or high-dose anabolic steroid use, hormone production and fertility can take months to recover. Some people develop persistent hypogonadism.
The medication may be mostly cleared from the bloodstream while the body is still recovering from suppressed hormone production.
The Practical Answer
- Testosterone gel: Blood levels usually return close to baseline within 2 to 5 days.
- One testosterone cypionate injection: Most of the medication may be eliminated in about 5 to 6 weeks.
- Long-acting testosterone undecanoate injection: Testosterone levels may remain clinically active for about 10 weeks or longer.
- Long-term or high-dose use: Natural testosterone production and fertility may take months to recover.
Do not stop prescribed testosterone without speaking with the prescribing clinician. If the concern involves a drug test, fertility, side effects or non-prescribed anabolic steroid use, the exact product, dose and last date of use are needed for a useful estimate.