A missed dose of testosterone injection happens to many people on treatment and is rarely an emergency. Do not double the next dose or add an extra shot to catch up. Testosterone labels give no rule for late or missed doses, so the safest step is to call your prescriber or pharmacist and ask whether to inject now and when your next dose should be. [1,2]
Key takeaways
- A missed testosterone injection lowers your level gradually, not suddenly: injected testosterone esters are absorbed slowly, and testosterone cypionate has a half-life of about eight days. [1]
- Missed testosterone injection symptoms, if any, are those of low testosterone, such as low energy, low motivation and reduced libido. When they appear varies widely between people. [3]
- Never double up. Your dose is set from your response, side effects and blood tests, not from a catch-up calculation. [1,2]
- Get urgent care for leg pain or swelling, sudden shortness of breath or chest pain, which can be signs of a blood clot. [1,2]
What to do after a missed dose of testosterone injection
What happens if you miss a testosterone shot? Your level falls gradually. Ask your prescriber or pharmacist two questions: should you inject as soon as possible, and should your schedule shift from that day? The prescribing information for testosterone cypionate and for Xyosted (testosterone enanthate) contains no missed-dose instruction, so the answer comes from your prescriber. [1,2]
| Situation | What to do | Why |
|---|---|---|
| Shot is a day or two late | Ask whether to inject now and whether to move your schedule. Do not double the next dose. | No label missed-dose rule; cypionate half-life about 8 days [1] |
| About a week late, or a whole dose missed | Same steps; ask whether your next blood test should be re-timed | Xyosted dose checks use a level drawn 7 days after a dose [2] |
| Several doses missed, or you want to stop | Talk to your prescriber before restarting or stopping | Treatment suppresses your own testosterone release [1] |
| Shot may have gone into fat, not muscle | Do not inject again; tell your prescriber; watch the site | Labeled for deep intramuscular use; subcutaneous cypionate kept levels in range in a small study [1,4] |
| Leg pain or swelling, sudden shortness of breath, chest pain | Seek urgent medical care | Possible blood clot (DVT or pulmonary embolism) [1,2] |
| Persistent or too frequent erections, nausea, vomiting, skin color changes, ankle swelling | Report to your prescriber promptly | Listed in the label’s patient instructions [1] |
Can you take your testosterone shot a day late?
Usually a shot taken a day late is a small change, because testosterone esters in oil are absorbed slowly from the muscle and levels decline gradually rather than all at once. There is no label rule for late doses, though, so ask your prescriber whether to inject today and whether to keep the new day. [1,2]
The same applies if a twice-weekly or every-other-week testosterone cypionate shot is 24 hours late: do not take extra to make up for it. For choosing your injection day and time of day, see our guide to the best time to inject testosterone cypionate.
What happens if you miss a week of TRT or testosterone?
If you miss a week of testosterone, your level keeps drifting down, and some people notice the symptoms that led to treatment while others notice nothing. In a study of 52 men with low testosterone, each man’s symptoms returned at a level that was consistent for him but differed markedly between men. [3]
How long a dose lasts depends on the product: testosterone cypionate is labeled for intramuscular use every two to four weeks, while Xyosted is a weekly injection under the skin of the abdomen. [1,2]
Missed testosterone injection symptoms: common side effects of missing TRT
The side effects of missing a dose of testosterone are not a drug reaction. They are the return of low-testosterone symptoms as your level falls. In men whose symptoms returned as testosterone fell, the most reported were lack of energy, lack of motivation and reduced libido. [3]
- Low energy or fatigue, one of the most reported symptoms. [3]
- Low mood or irritability. Some people describe this during a gap, but no study has measured how often it happens after a missed dose, and mood changes have many causes.
- No change at all. Because the symptom threshold differs so much between people, a single late dose may go unnoticed. [3]
What happens if you miss the muscle when injecting testosterone?
If a testosterone cypionate injection meant for the muscle goes partly into the fat under the skin, it is usually not an emergency, but tell your prescriber. Cypionate is labeled for deep intramuscular injection, yet weekly subcutaneous cypionate produced stable levels within the normal range in a small study. [1,4]
Pain or inflammation at the injection site is a known side effect. Call your prescriber if the site becomes increasingly painful, swollen or red, or if you notice signs of an allergic reaction. [1] Xyosted is different: it is injected under the skin of the abdomen, and its label says to avoid intramuscular injection. [2]
Missed doses of testosterone gel and other forms
For testosterone gel and other forms, the same rule applies: do not use extra product to make up for a missed dose, and check your product’s patient information or ask your pharmacist. FDA-approved testosterone comes as oral products, gels, patches, a buccal system and injections. [5]
Missed testosterone doses for trans men (FTM)
If you use testosterone as gender-affirming hormone therapy and miss a dose, the steps are the same: do not double the next dose, and ask the clinician who prescribes your testosterone, who sets your dose, schedule and monitoring. In a small study of 11 transgender men on weekly subcutaneous testosterone cypionate, levels stayed stable between injections. [4]
How to manage missed TRT doses and stay on schedule
Manage a missed TRT dose by calling your prescriber, restarting on the schedule they give you, and never catching up on your own. Doses are adjusted according to your response, side effects and blood tests. [1,2]
- Set reminders and keep a log of each dose.
- Tell your prescriber about missed doses before your next blood test, because dose checks rely on blood drawn at a set time after your last dose. [2]
- Never take more than prescribed. Testosterone is a Schedule III controlled substance, and its labeling describes taking higher doses than prescribed as misuse. [1]
What happens if you stop taking testosterone?
If you stop taking testosterone, your level falls as the last dose wears off, and symptoms of low testosterone may return. Your own production may take time to recover, because treatment suppresses the body’s own testosterone release through feedback on the pituitary hormone LH. [1] Do not stop without talking to your prescriber.
Testosterone therapy can also reduce or stop sperm production, and the Xyosted label states that the impact on fertility may be irreversible. [2,6] In studies of healthy men given testosterone-based hormonal contraception, the median time for sperm counts to recover after stopping was 3.4 months, and 90% had recovered within 12 months; recovery after long-term TRT may differ. [7] Labeling describes withdrawal symptoms only with higher-than-recommended doses; dependence at approved doses has not been documented. [1]
When to worry: when to call your prescriber or get care
Most missed or late doses need only a call to your prescriber. A few symptoms need urgent care, because testosterone labels list blood clots and allergic reactions among possible adverse events. [1,2]
Get urgent care for these symptoms
Pain, swelling, warmth or redness in one leg; sudden shortness of breath; chest pain; or signs of a severe allergic reaction after an injection. [1,2]
Contact your prescriber promptly for erections that are too frequent or will not go away; nausea, vomiting, changes in skin color or ankle swelling; or an injection site that keeps getting more painful, swollen or red. [1] If you are unsure whether a symptom is related to a missed dose, contact the clinic or your own prescriber.
What is testosterone replacement therapy (TRT), and why do steady levels matter?
Testosterone therapy treats low testosterone in men when it is confirmed by symptoms and repeated low morning blood tests. Steady dosing matters because the dose is adjusted to keep your level in a target range; guidelines aim for the mid-normal range. [1,8]
It is FDA-approved for men with low testosterone and an associated medical condition; the FDA has kept a “Limitation of Use” for low testosterone due to aging alone. [5]
Important safety information
Testosterone should not be used by men with breast cancer or known or suspected prostate cancer, or by women who are pregnant. Guidelines advise against starting it in men planning fertility soon or with an elevated hematocrit, untreated severe sleep apnea, uncontrolled heart failure, or a recent heart attack or stroke. [1,8] It can raise hematocrit (red blood cell levels) and blood pressure, so your clinician monitors hematocrit, blood pressure and PSA, and it can reduce sperm production and fertility. [2,5]
