Testosterone Therapy for Women: Side Effects to Know

Medically reviewed by: Katelyn Schwartz, NP, Family Nurse Practitioner with Advanced Training in TRT, BHRT, and Menopause Care
Last reviewed: August 2026

The question almost always arrives in the same order. First: could testosterone bring back the desire that quietly disappeared somewhere in perimenopause? Then, a minute later, what will it do to my skin, my hair, my voice?

That second question deserves a straight answer. The side effects of testosterone therapy for women are far more predictable than the internet suggests. Trial data shows clearly which ones are common and which are rare. It also shows that the frightening effects share a single cause: a dose higher than the body would ever make on its own.

Here is the honest version, including the benefits testosterone has not been shown to deliver.

What Testosterone Actually Does in a Woman’s Body

Testosterone gets filed away as a male hormone, which is a labeling problem rather than a biological one. Women make testosterone in the ovaries and adrenal glands, and across most of adult life it circulates at a higher level than estrogen does.

Levels fall gradually from a woman’s twenties onward, and age drives that decline rather than menopause itself. This is why the drop is rarely a clean before-and-after event. Surgery to remove both ovaries is the exception, and there the fall is sudden.

Now for the part that needs managing. Testosterone acts on many tissues, but “acts on” is not the same as “treatable with.” Only one outcome has held up across large trials in women. That outcome is sexual desire and, specifically, desire that has become distressing. The rest is either unproven or already tested and found wanting.

Our overview of TRT for women: myths, facts, and insights covers the wider picture.

Side Effects of Testosterone Therapy for Women at a Glance

This table summarizes what trials report at normal doses. Normal here means doses that keep blood levels inside the range a healthy woman sits in naturally before menopause.

Side effect	How often	When it appears	Reversible?
Acne or oilier skin	About 8% of women in trials	First 4 to 8 weeks	Yes, usually with a lower dose
Increased facial or body hair	About 9% of women in trials	2 to 6 months, gradual	Yes, though hair takes months to settle
Scalp hair thinning	Uncommon; no increase over placebo in pooled trials	Months, if at all	Often, if caught early
Mood or irritability changes	Reported by some women; no group effect in trials	Variable	Yes
Menstrual cycle changes	Relevant only before menopause; poorly studied	Variable	Usually
Voice deepening	Rare at normal doses; linked to excess dosing	Months of overexposure	Frequently not
Clitoral enlargement	Rare at normal doses; linked to excess dosing	Months of overexposure	Frequently not
Adverse cholesterol changes	Not seen with gels and creams; seen with oral tablets	Months	Depends on the route used

Two patterns stand out. The frequent side effects are cosmetic, dose-related and they fade. The frightening ones are genuinely rare, and in pooled trial data they cluster around doses that pushed blood levels above the female range.

The Common Side Effects, Explained

Acne and Oilier Skin

Oil glands in the skin respond to testosterone, so a rise in the hormone raises oil output fairly directly. Add a little more oil, add the skin bacteria that feed on it, and pores that were behaving perfectly well start to inflame.

About 8% of women in the dosing trials reported acne, usually in the first month or two. That is also the window when your prescriber should be checking blood levels anyway. Most cases settle after a dose reduction, and standard acne treatments work normally alongside hormone therapy.

Extra Hair Where You Did Not Want It

Testosterone converts to DHT in the skin, and DHT nudges fine, pale hairs into thicker, darker ones. On the face, chest or abdomen, that is the change women notice.

About 9% of trial participants reported increased hair growth. Hold onto that figure. Older consumer health articles often quote rates of 10% to 20% or higher, which overstates what controlled trials found.

The change is also slow, because hair follicles work on a months-long cycle. Nothing appears overnight, and nothing disappears overnight once the dose is adjusted.

One approach to avoid: adding an anti-androgen drug to counteract hair growth while continuing testosterone. That combination works against itself, and it is not recognised practice in women on normal-dose therapy.

Scalp Hair Thinning

The same DHT pathway that thickens facial hair can shrink scalp follicles, mainly in women already prone to female pattern hair loss. In pooled trial data, hair loss was no more common on testosterone than on placebo, so it is not a normal part of treatment.

It still matters, because the women most likely to notice it already have a family history. If thinning at the crown or a widening part appears after starting therapy, review the dose rather than waiting to see.

Mood, Energy and Irritability

Here the evidence and the anecdote part company. Some women describe feeling steadier and more motivated. Others describe a shorter fuse. When researchers pooled the trials, testosterone showed no measurable effect on general wellbeing or on low mood.

Both things can be true. Responses vary, and hormone therapy rarely happens apart from sleep, stress and the rest of a woman’s hormone picture. What the data does not support is starting testosterone with mood improvement as the goal.

Cycle Changes Before Menopause

Almost all of the good safety evidence comes from women past menopause. A few trials have looked at use before menopause. Menstrual outcomes were not the focus of any of them.

Androgens can influence ovulation, so irregular or lighter bleeding is plausible, but it is simply not well measured. Anyone who might become pregnant needs contraception in place first, because testosterone in pregnancy can affect how a female baby develops.

The Rare Side Effects That Worry People Most

Voice Deepening

This is the one women ask about with real anxiety, and the concern is fair, because vocal change often does not fully reverse.

The mechanism is simple. Testosterone thickens the vocal folds, and thicker folds vibrate more slowly, which lowers pitch. Once the tissue has remodelled, stopping treatment does not reliably undo it.

The reassuring part is the dose relationship. In trials that kept blood testosterone inside the normal female range, voice change was not a significant finding. Reported cases overwhelmingly involve long exposure to levels well above that range, which is a dosing and monitoring failure rather than a property of the hormone itself.

Women who sing, teach, or act should say so at the first visit. They should also keep to the blood-test schedule rather than testing when convenient.

Clitoral Enlargement

Clitoral enlargement follows the same logic. Tissue that responds to testosterone grows under long excess, and it may not shrink back later. Like voice change, it was not a significant finding in normal-dose trials, and it appears in the literature alongside excessive dosing.

The practical message is the same for both. The risk lives in the dose, not in the decision to treat.

What Testosterone Has Not Been Shown to Do

This section exists for a reason. Plenty of published content credits testosterone with benefits that trials did not find. When researchers pooled the trial data in women, testosterone showed no significant effect on:

Bone mineral density
Lean body mass, total body fat, or muscle strength
General wellbeing
Low mood
Cognitive performance

Hot flashes belong on that list too. Testosterone is not an established treatment for hot flashes or night sweats, and claims that it reduces them by month three are not supported by the evidence. Those symptoms are the territory of menopause hormone therapy, which has decades of trial data behind it.

None of this makes testosterone useless, but it does mean the honest indication is narrow. The Global Consensus Position Statement, endorsed by the International Menopause Society, The Menopause Society, and the Endocrine Society, recognizes one evidence-based use. That use is hypoactive sexual desire disorder after menopause, diagnosed through a full assessment.

The size of that benefit is worth stating plainly. Across trials, testosterone produced roughly one extra satisfying sexual event per four weeks compared with the placebo. For a woman genuinely bothered by low desire, that can matter a great deal. It is not a transformation, though, and any clinic promising one is overselling.

Heart and Metabolic Safety: The Route Changes Everything

Older articles often warn that testosterone raises LDL cholesterol in women. The pooled evidence is more specific than that, and the distinction turns entirely on how the hormone is delivered.

Oral testosterone passes through the liver before it reaches the bloodstream, and that first pass alters how the body handles fats. Trials of oral forms show unfavorable changes, particularly a drop in HDL cholesterol. This is a major reason oral testosterone is not recommended for women.

Gels and creams are absorbed through the skin, which bypasses that first liver pass. Pooled trials of these routes found no significant harm to cholesterol, no rise in blood pressure, and no change in blood sugar markers.

Long-term heart data in women is still thin. No trial has run long enough to settle whether testosterone affects heart attacks or strokes. Anyone with an existing heart risk deserves that stated out loud rather than smoothed over. Smoking adds its own layer, and our guide to HRT for smokers sets out what changes.

How Testosterone Is Prescribed to Women in Canada

Canadian context matters here, and most articles on this topic leave it out entirely.

No testosterone product is approved by Health Canada for use in women. Every prescription is off-label. That is not a fringe practice, and Canadian menopause guidance supports off-label use for postmenopausal women with distressing low desire. But it does mean treatment rests on the prescriber’s judgment rather than on a female-specific product label.

In practice, clinicians use the 1% testosterone gel licensed for men. They dose it at a small fraction of the male amount, measured out rather than applied as a full sachet or pump. The exact quantity is a clinical decision, set by the prescriber and adjusted on bloodwork and response.

Two delivery methods are specifically discouraged in women:

Pellets. The dose cannot be adjusted or withdrawn once implanted, and pellets commonly push blood levels above the female range.
Injections. Same problem, with the added issue of peaks and troughs between doses.

Compounded “bioidentical” testosterone is also not recommended by the same consensus statement. Its benefits and safety have not been tested to the standard applied to licensed products.

What Follow-Up Should Look Like

Blood tests are what keep the rare side effects rare. A sound standard, drawn from Canadian and global guidance, looks like this:

Total testosterone and SHBG measured before the first dose, to establish a baseline
A repeat level 3 to 6 weeks after starting, to confirm the dose has not overshot
Levels every 6 months after that, to catch drift above the female range
Total testosterone kept inside the premenopausal female range, with Canadian guidance advising it should not exceed 2.8 nmol/L
A clear stopping rule: no meaningful benefit after 6 months means stopping, not increasing

That last point is the one most often skipped. Raising the dose because a woman has not responded is exactly how safe therapy turns into overexposure. That is where voice and clitoral changes come from.

This is easier to weigh up with a clinician who prescribes women’s hormone therapy regularly. Our full range of women’s health services covers the broader hormonal picture that low desire usually sits inside.

High Testosterone in Women That Has Nothing to Do With Therapy

Not every symptom of this kind comes from a prescription. Plenty of women arrive with acne, unwanted hair, and irregular cycles that predate any treatment. The cause is usually their own hormone production.

The usual cause is polycystic ovary syndrome, or PCOS. Rarer causes include congenital adrenal hyperplasia and, rarely, a hormone-producing tumor of the ovary or adrenal gland.

What matters most here is speed. Slow change over years points toward PCOS. Fast change over weeks or a few months is a different matter. Voice deepening, clitoral enlargement, and male-pattern balding appearing together warrant urgent investigation.

Anyone with these symptoms needs a hormone workup before starting testosterone, not after. Adding more to a woman who already has too much is an easy way to cause harm.

Reducing Your Risk of Side Effects

Most of the risk here can be managed, and most of that work happens inside the first six months.

Get the diagnosis right first. Distressing low desire, properly assessed, is the indication. Fatigue, low mood and brain fog are not. Treating those with testosterone tends to produce side effects without the payoff.
Start at the low end. Dose increases should follow blood tests, not impatience.
Choose a route you can adjust. A gel can be reduced tomorrow. A pellet cannot.
Keep the six-month checkpoints. Skipped blood tests are the common thread in reports of lasting side effects.
Photograph your skin and hairline at baseline. Slow change is hard to judge from memory, and a dated photo settles it quickly.
Report voice changes immediately. Hoarseness or a lower pitch is not something to watch at home for a few months.
Agree on the stopping rule in advance. Knowing that six months without benefit means stopping removes the temptation to keep climbing.

Frequently Asked Questions

Q: What are the side effects of testosterone in females?

At normal doses the realistic list is short. Acne affects roughly 8% of women and increased facial or body hair affects roughly 9%, and both usually respond to a lower dose. Voice deepening, clitoral enlargement, and scalp hair loss are rare at these doses. They are linked to blood levels above the normal female range. Oral testosterone also affects cholesterol, which is why gels and creams are preferred.

Q: Can the side effects be reversed?

Most can. Acne, oiliness, mood shifts, and unwanted hair growth generally improve once the dose drops or treatment stops. Hair takes several months to reflect the change. Voice deepening and clitoral enlargement are the exceptions, and they frequently persist. That gap is the whole argument for careful dosing and regular blood tests.

Q: How quickly do side effects appear?

Skin changes come first, usually within four to eight weeks. Hair changes follow over two to six months, because follicles cycle slowly. The rare lasting effects need sustained overexposure, which is precisely why the 3-to-6-week and 6-month blood tests exist.

Q: Does testosterone help with hot flashes or brain fog?

Current evidence does not support either use. Pooled trials found no significant effect on thinking or memory, and testosterone is not an established treatment for hot flashes. Estrogen-based therapy is the evidence-based option there. A good assessment should also check thyroid function, sleep, and iron before blaming hormones for brain fog.

Q: Is testosterone safe for women long-term?

Short-term safety at normal doses looks reassuring in the trial data. Gels and creams showed no significant effect on cholesterol, no rise in blood pressure or blood sugar, and no increase in breast density on mammograms. Long-term trials simply have not been done. That gap is real, and it belongs in the conversation rather than in a footnote.

Q: Can women use testosterone therapy before menopause?

The evidence base is much smaller here. A few trials suggest benefits for sexual function before menopause. Sample sizes are small, though, and long-term safety in this group is not established. Contraception is essential, since testosterone in pregnancy can affect how a baby develops.

The Short Version

Testosterone therapy for women is either a narrow tool used well, or a broad promise used badly. The side effect profile follows directly from which one you get.

Kept inside the female range and monitored on schedule, the common effects are cosmetic and reversible, and the serious ones stay rare. Pushed above that range by pellets, rising doses, or skipped tests, the risk changes shape entirely.

The right starting point is not a dose. It is an assessment. That assessment confirms low desire is the actual problem, rules out a hormone excess, and sets the blood-test schedule before the first dose.

If that is a conversation you are ready to have, you can book a consultation with our women’s health team in Vancouver.

This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before starting any treatment.