Most people on testosterone replacement therapy inject once a week or once every two weeks, depending on the type of testosterone prescribed. The exact schedule depends on which formulation you’re using, how your body responds, and whether you’re injecting at home or receiving shots at a clinic. Here’s what each schedule looks like in practice.
Standard Weekly and Biweekly Schedules
The two most commonly prescribed injectable forms of testosterone, cypionate and enanthate, are typically given every one to two weeks. The American Urological Association lists the standard range as 50 to 200 mg injected every 7 to 14 days. Your prescriber will set your specific dose based on blood work and how you respond over the first few months.
Many providers now favor weekly injections over biweekly ones. The reason comes down to how the drug moves through your body: testosterone cypionate has a half-life of about seven days, meaning half the dose has been cleared by day seven. If you wait a full two weeks between shots, your levels can drop noticeably in the second week, leaving you feeling fatigued, irritable, or low-energy before your next injection. Splitting the dose into weekly (or even twice-weekly) injections keeps your testosterone levels more stable throughout the cycle and reduces those peaks and valleys.
Some people split their weekly dose into two smaller injections, given roughly every 3.5 days. This approach produces the smoothest blood levels and is especially useful if you notice mood swings or energy dips between weekly shots. After injection, testosterone levels peak within 24 to 48 hours, then gradually taper until the next dose.
Long-Acting Injections Every 10 Weeks
A long-acting option, testosterone undecanoate (sold as Aveed), requires far fewer injections. The schedule starts with a loading phase: a first injection, a second injection four weeks later, then one injection every 10 weeks after that. That works out to roughly five or six shots per year once you’re past the initial loading doses.
The tradeoff is convenience versus flexibility. You can’t self-administer this formulation at home. The FDA requires it to be given by a certified healthcare provider at a medical facility, so every injection means an office visit. For people who dislike needles or don’t want to manage a weekly routine, that schedule can still be appealing despite the clinic visits.
Short-Acting Formulations
On the other end of the spectrum, testosterone propionate is a fast-acting form that clears the body quickly. It requires injections every other day to three times per week to maintain steady levels. Medical doses typically fall in the range of 25 to 50 mg per injection, two to three times weekly. This frequency is impractical for most people on standard hormone therapy, which is why propionate is far less commonly prescribed than cypionate or enanthate.
Intramuscular vs. Subcutaneous Injections
Traditional testosterone shots go into the muscle, usually the buttock or thigh. But subcutaneous injections, given just under the skin in the abdomen with a smaller needle, are also an option. One subcutaneous formulation is prescribed at 75 mg once a week as a starting dose, adjusted based on follow-up labs. The injection method doesn’t dramatically change how often you inject, but subcutaneous shots tend to be less painful and easier to self-administer, which makes sticking to a weekly schedule more manageable for many people.
Why Consistency Matters More Than the Exact Day
Testosterone affects how your brain regulates emotions, so irregular injection timing can cause noticeable mood shifts. When levels spike after a shot and then drop steeply before the next one, you may experience irritability, fatigue, or sudden changes in mood. Keeping a consistent schedule, ideally on the same day each week, minimizes these fluctuations. If you find yourself regularly feeling run down in the days before your next shot, that’s worth raising with your provider. It often means the interval is too long for your metabolism, and switching to more frequent, smaller doses can smooth things out.
How Providers Adjust Your Schedule
Your injection frequency isn’t set permanently at the first appointment. Providers use blood work to fine-tune both dose and timing. For cypionate and enanthate, the recommendation is to wait at least three to four injection cycles before checking levels, so the medication has time to reach a steady state in your system. After that, testosterone levels are typically rechecked every 6 to 12 months.
For long-acting undecanoate, blood is usually drawn halfway between the first two maintenance injections (roughly five weeks after a shot) to see whether levels are holding in the target range. If your numbers come back too high or too low at the midpoint, your provider may adjust the interval or switch you to a different formulation entirely. The goal is to keep your testosterone in a stable, therapeutic range without excessive peaks that could increase side effects or troughs that bring symptoms back.