Testosterone Replacement Therapy: What It Is and What to Weigh

Testosterone replacement therapy, usually shortened to TRT, is the prescribed use of testosterone to treat diagnosed hypogonadism, meaning clinically low testosterone confirmed by testing alongside consistent symptoms. It is a legitimate medical therapy for the men who need it, and it is also heavily marketed to men who do not. Diagnosis comes before any prescription, and that diagnosis rests on repeat morning bloodwork rather than on a symptom checklist.

Testosterone is a Schedule III controlled substance in the United States. It requires a prescription written for a named patient, and dispensing is regulated accordingly. Bayview Pharmacy compounds and dispenses compounded testosterone against a valid prescription; we do not diagnose, we do not provide consultations, and we do not determine whether TRT is appropriate for anyone.

What is testosterone replacement therapy?

TRT supplies testosterone from outside the body to bring levels into a target range set by the prescriber. It is ongoing rather than a course: stopping generally means levels return to where they were.

That framing matters, because it separates the therapy from the way it is often sold. TRT is long-term management of a diagnosed endocrine condition. It is not a performance product, a fitness aid or an anti-ageing regimen, and a level sitting at the low end of a laboratory reference range is not by itself a reason to start.

How is low testosterone diagnosed?

This is the part worth taking seriously. Symptoms often attributed to low testosterone, including fatigue, low libido, low mood, reduced muscle mass and poor sleep, overlap substantially with sleep apnoea, depression, thyroid disease, diabetes, anaemia, medication effects and ordinary life. None of them, alone or together, establishes that testosterone is the cause.

Professional guidance is consistent on the approach: diagnosis rests on symptoms plus low testosterone measured on at least two separate morning samples, since levels vary through the day and from day to day. A single afternoon result is not a diagnosis. Prescribers typically also look at LH, FSH and prolactin to work out where the problem originates, since that changes what should be done about it.

Reference ranges also differ between laboratories and between assay methods, and they were derived from populations rather than from any one person. A result just under a cutoff on one report can sit inside the range on another, which is a further reason a diagnosis is not made from a single tube of blood.

Where those additional results point to a pituitary problem rather than a testicular one, or where fertility is a concern, a prescriber may look at options other than testosterone entirely. Our article on clomiphene for low serum testosterone describes one such route, which acts on a different mechanism.

What forms does testosterone come in?

Forms include intramuscular or subcutaneous injections, topical gels and creams applied daily, patches, implanted pellets, and buccal or oral preparations. The choice is a clinical one, balancing how steady the levels need to be, how the patient prefers to take it, and practical considerations such as transfer risk with topicals.

The table below sets the routes side by side. Read the status column first: most testosterone products on the market are FDA-approved manufactured items, and compounding covers what that range does not.

Nothing in that table is a recommendation. Strength, quantity and interval are decisions the prescriber makes for the individual patient, manufactured products carry their own labelling, and a compounded preparation is made to whatever the prescription specifies.

What are the risks, and what gets monitored?

TRT is not a benign supplement, and the monitoring exists for reasons.

Red blood cells. Testosterone can raise haematocrit, which thickens the blood and is monitored with periodic blood counts. Dose reduction or interruption is sometimes needed.

Prostate. Prescribers assess prostate status before starting and monitor PSA during therapy, and TRT is avoided in the presence of known or suspected prostate cancer.

Other. Acne, oily skin, breast tenderness, fluid retention, mood changes, and worsening of untreated sleep apnoea are reported. Testosterone product labelling carries warnings about cardiovascular considerations and about blood pressure, and the picture there has been debated in the literature for years; it is a conversation to have with a prescriber who knows your history.

Transfer. Topical testosterone can transfer to other people through skin contact, including children and partners, with real consequences. Cover the area, wash hands, and follow the label.

Transfer is the risk most often underestimated at home. A gel or cream applied to the shoulders or upper arms can reach a partner or a child through ordinary contact for hours afterwards, which is why product labelling asks for the area to be covered by clothing once dry and for hands to be washed straight away. Where that cannot be managed in a particular household, prescribers often move to a form that is not applied to the skin.

Monitoring is a schedule rather than a single check. Testosterone level, haematocrit and PSA are among the things followed at intervals the prescriber sets, and what your own schedule should look like is a question for the prescriber who ordered the therapy.

Does TRT affect fertility?

Yes, and this is the tradeoff most often missed. Exogenous testosterone suppresses the body's own production and can substantially reduce sperm count, sometimes durably. Any man who may want children in future should raise this before starting, not after.

The mechanism explains it. Testosterone taken from outside the body reduces the pituitary signals that drive testicular function, and sperm production depends on those signals. Recovery after stopping varies between individuals and is not assured.

Where fertility is the deciding factor, a prescriber may consider agents intended to raise the body's own testosterone rather than replace it. Enclomiphene is one of these; it is not an FDA-approved product, so any prescription is compounded and the published evidence should be weighed with the prescriber.

What does testosterone therapy not address?

Erectile dysfunction is the clearest example. Low testosterone can contribute, but vascular disease, diabetes, medication effects and anxiety are more common causes, and bringing a testosterone level into range does not necessarily change erectile function. Prescribers commonly evaluate the two separately.

Where an oral PDE5 inhibitor is the starting point, sildenafil is the most familiar of them and is dispensed on a prescriber's order like any other prescription medicine.

Our overview of sildenafil and how it is prescribed goes through timing, interactions and the nitrate contraindication in more detail.

For men in whom an oral option is not appropriate, a prescriber may consider alprostadil, papaverine and phentolamine intracavernosal injections, which are compounded rather than manufactured and are started under clinical supervision.

Is this the same as testosterone therapy for women?

No. Testosterone is also prescribed for women, at strengths far below a male replacement dose, and the clinical question behind it is a different one. Testosterone for women is prepared as a low-strength cream or oral form on a prescriber's order.

Our article on testosterone therapy for women covers the 2019 Global Consensus Position Statement on testosterone therapy for women and why most other uses in women are described as off-label.

Why is testosterone a controlled substance?

Testosterone is a Schedule III controlled substance under the Controlled Substances Act, a classification it shares with other anabolic steroids. That status reflects potential for misuse, and it changes the practical mechanics of getting a prescription filled.

In practice it means a prescription written for a named patient, limits on refills set by federal and state law, and a prescription that generally has to be sent to the pharmacy electronically rather than carried in. Controlled substances are not shipped to New York addresses.

Questions about the states where Bayview is licensed, about how shipping works, and about what a preparation costs are answered on our frequently asked questions page.

Where does compounding fit?

Manufactured testosterone products exist in several forms, and where one fits the prescription, that is what should be dispensed. Compounding is for what is not manufactured: a strength, a base, or a dosage form a prescriber specifies for an individual patient. Compounded preparations are not FDA-approved.

Under section 503A of the Federal Food, Drug, and Cosmetic Act, a compounding pharmacy may not prepare a drug product that is essentially a copy of a commercially available one. That is why a compounded testosterone prescription is written for something the manufactured range does not cover, such as a strength between the available ones or a base a patient can tolerate.

Our hormone preparations sit in the hormone replacement therapy category, alongside estradiol, progesterone and DHEA preparations for other patients.

The hormone replacement therapy service page sets out how a prescription reaches us and what a prescriber needs to specify on it.

Wider background on hormone therapy generally is in our overview of hormone replacement therapy.

If you would rather browse, the searchable catalog of compounded medications lists each preparation with its dose forms and starting price.

What Bayview compounds for this

On a prescriber's order, Bayview Pharmacy prepares testosterone creams and oral preparations in the strength written on the prescription, using USP 795 non-sterile compounding at our lab in Warwick, Rhode Island. Compounded testosterone starts at $90, with the final figure set by the strength, dose form and quantity. It is dispensed only against a prescription written for a named patient.

Talk to your prescriber

If low testosterone is suspected, the first step is testing and a conversation with a prescriber, not a purchase. Ask for morning bloodwork on two separate days, ask what else could account for the symptoms, and ask what the monitoring schedule would look like before agreeing to start anything.

If you may want children, say so at that first conversation rather than later. And if a prescription is written and a compounded form is specified, it can be sent to us directly: your prescriber decides the dose, the form, and whether the therapy is appropriate for you at all.