ED and Low Testosterone: TRT, ED Pills, or Both? (2026)

Do you need TRT, an ED pill, or both?

This page is for men who have erectile dysfunction and clinically low testosterone — a specific overlap that needs a different game plan than ED alone. The short version: confirm low T on two morning labs first, treat the proven cause, and in many cases combine an FDA-approved testosterone patch with a PDE5 inhibitor rather than betting on one. Testosterone replacement (TRT) and ED pills work on completely different parts of the erection — hormones drive desire and tissue health; PDE5 inhibitors drive blood flow on demand — so picking the wrong one alone is a common reason men stay frustrated.

For the broader question of why erections fail in general — vascular disease, diabetes, anxiety, medications — see our companion guide on what causes erectile dysfunction. This page stays narrowly on the ED-plus-low-T decision.

At a glance: which path fits you?

Numbers reflect Ro’s published 2026 pricing; the visit is free and there is no membership fee for ED.

Why check testosterone before choosing a treatment?

Because the two problems demand different drugs, and only a blood test tells them apart. The American Urological Association (AUA) defines low testosterone as a total testosterone consistently below 300 ng/dL, measured on two separate early-morning blood draws (typically 7–11 a.m.), confirmed alongside symptoms like low libido or fatigue. Testosterone peaks in the morning and swings during the day, so a single afternoon test can falsely flag — or falsely reassure — you.

This lab-first gate matters for two reasons. First, starting TRT in a man whose testosterone is actually normal exposes him to side effects (acne, sleep apnea worsening, fertility suppression, possible cardiovascular monitoring) with little chance of fixing his erections. Second, if your T is genuinely low, treating it may restore desire and morning erections that no ED pill addresses. The diagnosis drives the whole plan — which is why a provider who can order the labs, read them, and prescribe accordingly is worth more than a service that only ships pills.

When is TRT alone the right choice?

TRT alone makes sense when low testosterone is the dominant problem — confirmed low T plus prominent low libido, low energy, and loss of spontaneous erections — and when the ED is mild or driven mostly by reduced desire. Replacing testosterone (via an FDA-approved testosterone patch or other approved formulation) can improve libido, mood, and in some men erectile function, because androgens support the nerve and tissue health that erections rely on.

But set expectations honestly. The strongest erectile-function gains from testosterone show up in men who are clearly hypogonadal, not in men with borderline or normal levels. If your testosterone normalizes on treatment and erections improve, you may not need a pill at all. If desire returns but rigidity is still short, that is the signal to layer in a PDE5 inhibitor — which brings us to the combination.

When does combining TRT and an ED pill work best?

Combination therapy shines in men with confirmed low testosterone who did not get an adequate erection from a PDE5 inhibitor alone. The clearest evidence comes from a randomized, double-blind, placebo-controlled trial of 75 hypogonadal men (morning total testosterone ≤400 ng/dL) who had failed sildenafil monotherapy: adding daily testosterone gel to sildenafil produced significantly greater improvement in erectile-function scores than adding placebo (4.4 vs 2.1 on the IIEF erectile-function domain at week 4, p=0.029), with similar trends for orgasmic function and overall satisfaction. The authors concluded testosterone “may be beneficial in improving erectile function in hypogonadal men with erectile dysfunction who are unresponsive to sildenafil alone.”

The mechanism is intuitive once you see it: PDE5 inhibitors only work well when the nitric-oxide pathway is primed, and testosterone helps maintain that pathway. Restore the hormone, and the pill that “didn’t work” may start working. That is why the combination outperforms either treatment in isolation for this specific group — and why having one provider manage both, rather than two disconnected services, removes the friction of getting there.

What does each path cost, and where can you coordinate both?

Cost depends on the path. For ED pills alone, generic sildenafil starts around ~$2/dose through Ro and daily tadalafil 7mg runs $89/month (one-month) dropping to $69/month on a three-month plan. For Hims, generic sildenafil starts at $22/month and generic tadalafil at $24/month as “starting at” marketing figures. TRT pricing is set after labs confirm you qualify; it is not a flat retail number you should commit to before testing.

The bigger cost is friction. If you use a pills-only ED service and your real problem is low testosterone, you pay for pills that underperform, then start over somewhere else for labs and TRT. The efficient path is one provider who can do all of it.

Verdict: Ro, because one platform handles labs, TRT, and ED pills

If you have both ED and possible low testosterone, Ro is our pick for the simple reason that it closes the loop. Ro scripts both an FDA-approved testosterone patch (through its TRT program) and the full range of ED medications, so a single US-licensed provider can order your morning labs, confirm whether your testosterone is genuinely low, start TRT if it is, and layer a PDE5 inhibitor when erections need extra help. No pills-only ED service can do that. The online visit is free, there is no membership fee for ED, the pharmacy network is LegitScript-certified, and shipping is free in discreet packaging. For men whose situation may evolve from “just a pill” to “labs and TRT,” that one-account coordination is the whole point.

Hims is a solid secondary option if you only need ED pills and want the lowest sticker price, but its ED service is not built around coordinating TRT with your erection treatment the way Ro’s is.

A note on compounded products: Ro Sparks (compounded sublingual sildenafil 55mg + tadalafil 22mg) and Hims Hard Mints are compounded formulations — they are not FDA-approved as finished products. They can be convenient, but for the ED-plus-low-T decision your foundation should be standard, well-studied generics (sildenafil, tadalafil) plus an FDA-approved testosterone product when TRT is warranted.

Safety: what you must tell your provider

Frequently asked questions

Can low testosterone cause erectile dysfunction on its own?

Low testosterone can contribute to ED, mainly by reducing sexual desire and the spontaneous, nighttime erections that depend on healthy tissue. But most ED has vascular, neurological, or psychological causes that testosterone won’t fix. That’s why confirming low T on two morning labs — and ruling other causes in or out — matters before assuming testosterone is the problem.

Will TRT fix my erections if my testosterone is normal?

No. If your total testosterone is already in the normal range (consistently above 300 ng/dL), adding testosterone is unlikely to improve erections and exposes you to side effects without benefit. In men with normal T and ED, a PDE5 inhibitor like sildenafil or tadalafil is first-line. Save TRT for confirmed, symptomatic low testosterone.

Why do I need two blood tests to diagnose low testosterone?

Testosterone peaks in the early morning and naturally swings, so one reading — especially in the afternoon — can mislead. The AUA recommends confirming a level below 300 ng/dL on two separate early-morning draws (roughly 7–11 a.m.), alongside symptoms, before diagnosing low testosterone and considering TRT.

Is combining TRT and an ED pill safe?

For appropriately selected men, yes — they act on different mechanisms and are commonly used together. A randomized trial found testosterone added to sildenafil improved erectile function more than sildenafil alone in hypogonadal men. Safety still hinges on screening: no nitrates with PDE5 inhibitors, and TRT requires monitoring bloodwork. A provider who manages both can coordinate the checks.

How long until I notice results from each treatment?

ED pills work fast — sildenafil within about an hour, tadalafil within 30–60 minutes, with daily tadalafil building steadier readiness over a week or two. TRT works slowly; libido and energy may improve over weeks, and any erectile benefit can take several weeks to a few months. If you’re combining them, the pill gives near-term help while TRT addresses the underlying hormone.

Can I get both TRT and ED medication from one telehealth provider?

Yes. Ro runs both a TRT program (FDA-approved testosterone patch) and a full ED program on the same account, so one US-licensed provider can order labs, confirm whether your testosterone is low, and prescribe TRT, an ED pill, or both. Coordinating both through a single provider is more efficient than splitting care between a pills-only ED service and a separate hormone clinic.

Does Ro charge a fee just to ask about TRT and ED?

No. Ro’s online visit is free, and there is no membership fee for its ED program. You complete an online intake, a provider reviews it (and orders labs if TRT is being considered), and a prescription is written only after the visit if it’s appropriate. You pay for medication and labs, not for the consultation itself.

What if my erections still aren’t strong after starting TRT?

That’s exactly the scenario where adding a PDE5 inhibitor helps most. The randomized evidence shows hypogonadal men who don’t respond to an ED pill alone often improve once testosterone is restored — and men on TRT whose rigidity lags benefit from layering in sildenafil or tadalafil. Tell your provider; the fix is usually combining, not switching.

Sources

1. Shabsigh R, Kaufman JM, Steidle C, Padma-Nathan H. “Randomized study of testosterone gel as adjunctive therapy to sildenafil in hypogonadal men with erectile dysfunction who do not respond to sildenafil alone.” Journal of Urology. PubMed 18405769
2. Jacob BC. “Testosterone replacement therapy in males with erectile dysfunction.” Journal of Pharmacy Practice, 2011. PubMed 21676853
3. American Urological Association — Evaluation and Management of Testosterone Deficiency Guideline (diagnosis: total T <300 ng/dL on two early-morning draws). AUA Guideline
4. Androderm (testosterone transdermal system) — FDA-approved prescribing information; confirm hypogonadism with morning testosterone on two separate days. FDA label PDF
5. MedlinePlus (NIH) — Testosterone Transdermal Patch drug information. MedlinePlus
6. MedlinePlus (NIH) — Sildenafil drug information (nitrate contraindication). MedlinePlus
7. GoodRx — generic sildenafil price benchmark. GoodRx sildenafil

Related reading

• What causes erectile dysfunction? — the general causes this page deliberately leaves to its companion guide.
• Best daily ED medication (2026) — daily tadalafil vs as-needed options.
• Ro review (2026): every product, plan, and price — full breakdown of Ro’s ED and TRT lineup.
• Best ED treatment programs (2026) — how the top telehealth ED platforms compare.
• Compare ED treatment providers — side-by-side of every ED service we track.
• The complete guide to erectile dysfunction treatments (2025) — our pillar overview of every ED option.