Masculinizing Hormones
Masculinizing hormone therapy is, for almost everyone, one medicine: testosterone. Unlike feminizing HRT, there's usually no second drug to block anything, because testosterone at the levels a prescriber aims for overrides the body's own estrogen. What varies is the form it comes in, how steady it keeps your levels, and how your body responds.
That steadiness is the thread through this whole section. Most of the side effects people run into, the acne that flares a few days after a shot, the mood that dips the day before the next one, the hematocrit that creeps up, trace back to how much your levels swing between doses rather than to the average dose itself. A lot of what a good prescriber does in the first year is smoothing those swings out.
It works on the timescale of puberty. Skin and libido tend to change in the first weeks or months, periods usually stop within the first several months, and the voice drops across roughly the first year. Hair, muscle and fat keep shifting for several years after that. Some changes stay even if you stop, the voice and facial hair most obviously, and some things testosterone doesn't touch at all: it won't remove chest tissue or make you taller once you've finished growing. Is HRT reversible? covers what stays.
Periods stopping isn't the same as not being able to get pregnant. Ovulation can still happen on testosterone, and testosterone can harm a pregnancy, so anyone having sex that could lead to pregnancy needs separate contraception.
In the Bangkok hospitals where I coordinate surgery, almost every trans man I have helped has been on testosterone for a year or more by the time he arrives, and the questions I hear are consistent. What will still change? Why haven't my periods stopped? Do I need to stop before the operation? Those questions shaped the guides in this section. The last one has its own page, hormones and surgery.
Who masculinizing HRT is for
Testosterone is for anyone who wants their body to move in a more masculine direction: trans men, many non-binary people, and some people who want a few of its changes and not the rest. You don't need surgery planned, and you don't need to want everything on the timeline.
What prescribers ask about is mostly health. Expect questions about blood pressure, cholesterol, smoking, sleep apnoea, liver problems, past clots, acne and any medicines you take, plus whether you could be pregnant and what you'd like to do about contraception. Most of these don't rule testosterone out. They shape the form a prescriber suggests and what they'll watch on your blood tests. Polycystic ovary syndrome comes up fairly often, and it isn't a barrier either.
If you want something other than the full plan, say a lower dose, or a limited course that stops once the voice has dropped, raise it at the first appointment. A lower dose slows changes; it can't choose which ones arrive, and non-binary and low-dose HRT explains how to plan around that.
Most adult services start at 18. The route in, a single informed consent appointment or an assessment at a gender clinic, depends on where you live.
Before your first appointment
Decide what you want to do about contraception and fertility, even if the answer is "nothing yet". Both come up early, and it's easier to think them through at home than to be asked cold in a ten-minute consultation.
Choosing between them
The main choice is the form, and it's a trade between convenience and steadiness.
Short-acting injections (testosterone cypionate in the US, enanthate or a mixed-ester product elsewhere) are the cheapest and most common. Weekly doses give flatter levels than fortnightly ones; many people start fortnightly and move to weekly or twice-weekly smaller doses once the swings become obvious. You can learn to inject yourself, under the skin or into muscle depending on the product and your prescriber.
Long-acting injections (testosterone undecanoate) go into muscle every ten to fourteen weeks or so, given by a nurse. Levels are steady once established, but the dose can't be changed quickly and the first few months take a loading schedule. They're widely used in the UK.
Gels and patches give the flattest daily levels and suit people who don't want needles, at a higher monthly cost and with the need to keep skin contact away from partners and children until the gel has dried. Pellets exist, mostly in the US, and are usually somewhere people move to once they're stable rather than where they start.
I'd treat your first form as a starting point, not a commitment. Plenty of people change once they've lived with one for six months and know what bothers them. Testosterone has the detail on each form and the blood levels prescribers aim for.
In the first few months
Keep a short note of how you feel day by day across one or two dosing cycles, energy, mood, skin, irritability. A pattern that lines up with your injection day is something your prescriber can fix by changing the interval, and it's much easier to show than to describe.
Guides
There's one medicine page here, because there's one medicine, and it's the one to read first: the form you choose shapes most of what's on the other three. After that, the timeline is for knowing what's coming and what isn't, periods gets its own page because it's the question that comes up most in the first year, and the risks page is the one to keep handy.
The medicine
Testosterone
Injections, long-acting injections, gels, patches and pellets: how each form works, how steady it keeps your levels, and how people choose.
What to expect
What Changes, and When
The rough order testosterone's changes arrive in, which ones are permanent, and where other options take over.
Periods on Testosterone
How long periods usually take to stop, breakthrough bleeding, options if they persist, contraception, and cervical screening on testosterone.
Risks and Side Effects
The side effects people notice, the risks prescribers watch for in blood tests, and the symptoms that need a doctor straight away.
Masculinizing HRT cost
Generic testosterone injections are among the cheapest medicines in transition. In the US they commonly run around $30 to $100 a month including needles and syringes, paying cash with a discount card; gels cost more, often considerably. In England, once a GP prescribes under shared care, you pay the standard prescription charge per item, and long-acting injections given at the surgery cost nothing extra.
As with feminizing hormones, the larger costs sit around the medicine: appointments, especially privately, and blood tests, which are most frequent in the first year. Sharps bins are often free in the UK, through a pharmacy, GP or council, and cheap in the US. Cost and insurance covers typical ranges, prior authorisation and what to ask an insurer.
Where it fits
Testosterone usually comes first, and other steps are timed around it.
Fertility is the decision to make before the first dose. Egg freezing is much simpler before testosterone than after, though people do pause testosterone later to have it done. Fertility covers both routes.
Top surgery doesn't depend on testosterone, and many surgeons don't require it. Some people prefer to wait a while on testosterone because fat redistribution changes the chest and torso. Hysterectomy and oophorectomy change your prescription afterwards: without ovaries, testosterone becomes your only source of sex hormone for bone health, so stopping it for long stretches is no longer neutral. Metoidioplasty relies on the growth testosterone produces, and most surgeons want a year or more on it first.
Whether to pause testosterone around an operation is your surgeon's decision, and most don't ask you to. Hormones and surgery covers how it's usually handled.
This is general information, not medical advice. Your prescriber, who can see your blood results, decides the dose; don't start, stop or change it without them.
Clinics that do masculinizing HRT
Frequently asked questions
How soon will my voice drop?
Often within the first few months, with most of the change across the first year. Once it has dropped it doesn't go back up if you stop. See what changes, and when.
Which form of testosterone is best?
None is best for everyone. Injections are cheapest, gels and long-acting injections give steadier levels, and many people switch once they know what suits them. See choosing between them.
Is testosterone contraception?
No. Ovulation can still happen even when periods have stopped, and testosterone can harm a pregnancy. See periods on testosterone.
What is hematocrit and why does it keep being checked?
It's the share of your blood made of red cells, which testosterone pushes up. Too high thickens the blood, so it's the result prescribers watch most. See risks and side effects.
Do I need to be on testosterone before top surgery?
Usually not. Some people choose to wait for fat redistribution first; metoidioplasty is different and needs testosterone. See where it fits.
Not sure where to begin?
The Start Here guide covers what hormones change, how people get a prescription, what the blood tests are for and what it costs.
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