Testosterone and ED: Does TRT Help, and Can It Cause ED?

Below: how testosterone fits into ED, what three major trials found, whether TRT can cause ED, who should be tested, and what programs charge for TRT, ED pills or both. All sources were read on 14 November 2026. We list prices, never doses.

How testosterone and ED are connected

Erections depend on blood flow, nerves and hormones working together. The NIH lists "hormone issues, such as low testosterone and thyroid imbalance" among the most common causes of ED (NIDDK: Symptoms and causes of ED, read 14 November 2026). It lists heart and blood vessel disease, diabetes and medicines in the same breath.

So low testosterone is one cause among several, and often not the main one. Many men have both low testosterone and another cause, such as diabetes or narrowed arteries. That is why fixing the hormone alone often does not fix the erection.

Testosterone matters most for desire. Men with low testosterone often notice low interest in sex before they notice weaker erections. That difference shows up clearly in the trials below.

Does testosterone help erectile dysfunction?

Three large trials give the clearest answers. Their results differ, and the differences are worth knowing.

Read together, the picture is this. TRT tends to help desire and how often men have sex. Its effect on erections themselves is small or absent in the larger, longer trial.

The trial that tested testosterone on top of Viagra

The 2012 trial asked the question many men ask: if I already take sildenafil (Viagra), will adding testosterone help? All 140 men had their sildenafil adjusted first. Then half added a testosterone gel and half a dummy gel, chosen at random, for 14 weeks.

Sildenafil alone helped a lot. The study reports "Administration of sildenafil alone was associated with a substantial increase in EFD score", which is a standard erection score. Administration here simply means taking it. Adding testosterone did not add more: "Sildenafil plus testosterone was not superior to sildenafil plus placebo in improving erectile function in men with erectile dysfunction and low testosterone levels" (Spitzer et al., PubMed, read 14 November 2026). Placebo means a dummy gel with no hormone, the gel version of a dummy pill.

The authors note one limit: "Whether testosterone could improve erectile function without sildenafil was not studied."

What TRAVERSE found

TRAVERSE was a large trial built mainly to test heart safety. Inside it, a sexual function study followed 1,161 men with low testosterone and low desire for up to two years. They used a testosterone gel or a dummy gel, chosen at random.

Its conclusion: "In middle-aged and older men with hypogonadism and low libido, TRT for 2 years improved sexual activity, hypogonadal symptoms, and sexual desire, but not erectile function" (Pencina et al., PubMed, read 14 November 2026). Hypogonadism means the body makes too little testosterone. Libido means sex drive.

The older Testosterone Trials were more positive on erections. They found testosterone "associated with significantly increased sexual activity", with increased "sexual desire and erectile function" (Snyder et al., PubMed, read 14 November 2026). That trial lasted one year and enrolled men aged 65 and over.

What the NIH says about using both

The NIH's advice fits the trials. "If you have ED and low testosterone, health care professionals may prescribe testosterone with PDE5 inhibitors" (NIDDK: Treatment for ED, read 14 November 2026). PDE5 inhibitors are the ED pill family: sildenafil, tadalafil and others.

In practice, that means testosterone treats the low hormone and its symptoms, such as low desire and tiredness, while an ED pill treats the erection. Some programs sell both under one account; see TRT and ED from one program.

Can TRT cause ED?

It is not a common effect on the labels. The AndroGel 1.62% label lists "decreased libido" among rare reports after the drug went on sale, and "libido decreased" among reactions in 2% of men or fewer in its trial (DailyMed: AndroGel 1.62% label, read 14 November 2026). The same postmarketing list includes "priapism (frequent or prolonged erections)", which is the opposite problem.

Two other label points often come up in the same conversation. Testosterone from outside the body can shrink sperm output: "spermatogenesis may be suppressed", meaning sperm making slows down. And "testicular atrophy", smaller testicles, is listed too. Neither is the same as ED, but both are reasons some men ask about enclomiphene instead; see enclomiphene vs TRT.

If erections get worse on TRT, the cause may be something else: the original cause of the ED, a new medicine, blood pressure, or stopping and starting treatment. Tell the prescriber; our TRT side effects guide covers the label warnings.

Can testosterone cause ED if you stop?

Stopping TRT lets testosterone fall back, often to where it started, and the symptoms that came with low testosterone can return. That can include low desire. Do not stop or change TRT without the prescriber, who can plan how to come off it.

Who should get tested first

TRT is approved for men with a real testosterone deficiency, not for ED alone. The AndroGel label says it is for "conditions associated with a deficiency or absence of endogenous testosterone", meaning the body's own testosterone. For men with low testosterone from aging alone, which the label calls age-related hypogonadism, it says safety and efficacy "have not been established". In plain words, nobody has shown how well or how safely it works for that group.

So the first step is a blood test. A man with ED and normal testosterone will not get an erection boost from TRT. A man with ED, low desire and low testosterone may benefit from both treatments. Our testosterone test cost guide prices the at-home and lab options.

What TRT, ED pills and combined plans cost

An ED pill is much cheaper than TRT. Generic sildenafil starts at $1.60 a dose at Strut Health, visit included. The cheapest all-in plan we list for low testosterone, TRT or enclomiphene, is $79 a month at Strut Health, as checked November 14, 2026. Many testosterone prices add a membership or first labs on top.

Two products pair testosterone support with tadalafil in one prescription. Both use enclomiphene, a pill that pushes the body to make more of its own testosterone, rather than testosterone itself.

Hims:

Rugiet:

Every testosterone price is on our testosterone price page, programs are ranked on Best low testosterone programs, and ED programs on Best online ED programs.