# Testosterone vs ED Medication: Which Problem Do You Actually Have?

> These treat different things. Testosterone drives desire; PDE5 inhibitors drive blood flow. Confusing the two leads men to take a hormone they do not need — with consequences including infertility.

- **Source:** ED Treatment Guides (https://www.edtreatmentguides.com/compare/trt-vs-ed-medication)
- **Last updated:** 2025-11-18
- **Type:** comparison
- **Compares:** Testosterone therapy vs PDE5 inhibitors

## Key points

- Testosterone drives **desire** far more than it drives the mechanics of an erection. That distinction explains most of the confusion.
- Treating a normal testosterone level does not improve erections and carries genuine risks.
- Diagnosis requires **two morning blood tests** on separate days plus matching symptoms. One afternoon test proves nothing.
- In men who are genuinely deficient, correcting testosterone can make a previously ineffective PDE5 inhibitor start working.
- Testosterone therapy suppresses fertility. Raise it before you start — see [ED and fertility](https://www.edtreatmentguides.com/guides/ed-and-fertility).

## Testosterone therapy vs PDE5 inhibitors

|  | Testosterone therapy | PDE5 inhibitors |
| --- | --- | --- |
| Primarily treats | Low desire, energy, mood | The mechanics of an erection |
| Works if levels are normal | No | Yes |
| Diagnosis needed first | Two morning blood tests plus symptoms | Clinical history |
| Time to effect | 3–6 weeks for libido; up to 6 months for erections | First proper attempt |
| Effect on fertility | Suppresses sperm production, often to zero | No meaningful effect |
| Monitoring required | Haematocrit, PSA, symptoms — ongoing | Minimal |
| Reversible | Yes, but recovery can take months | Immediately |
| Typical cost | $20–$150/month plus bloodwork | $5–$50/month generic |
| Can be combined | Yes — often better together in deficiency | Yes |

## Verdict

If your desire is intact but your erections are not, you want a PDE5 inhibitor and an investigation of vascular causes — testosterone will not help and carries real risks. If desire, energy, mood and morning erections have all faded together, get two morning testosterone tests before anything else. Where deficiency is confirmed, the two work better together than either alone. The one decision to get right before starting testosterone is fertility: it suppresses sperm production, and alternatives exist that do not.

## Which problem do you have?

**Reading your own symptoms**

| Pattern | Points towards |
| --- | --- |
| Strong desire, poor erection | Vascular or psychological. **PDE5 inhibitor**; testosterone is unlikely to help. |
| Desire gone, along with energy, mood and morning erections | **Test testosterone.** This is the pattern that justifies it. |
| Poor response to tablets *and* confirmed low testosterone | **Both.** Correcting testosterone can restore the response to the tablet. |
| Normal testosterone, still no improvement | Look elsewhere — see [when medication fails](https://www.edtreatmentguides.com/guides/when-medication-fails). |
| Low testosterone with a low or normal LH | Check prolactin before treating — see [thyroid and prolactin](https://www.edtreatmentguides.com/causes/thyroid-and-prolactin). |

## Why this gets confused so often

Testosterone is marketed heavily, and it is marketed as a solution to a broad, vague set of complaints — tiredness, low mood, weight gain, poor performance — that most men over 40 can recognise in themselves. Erectile dysfunction gets folded into that list, and clinics whose revenue depends on prescribing have an obvious incentive to interpret borderline results generously.

> **Signs of a clinic to walk away from**
>
> Prescribing on a single afternoon blood test. No LH or prolactin measured. No conversation about fertility. No monitoring plan for haematocrit. A recommendation to start before results are repeated. Any of these should stop you.

None of this means testosterone therapy is illegitimate. For men with genuine, confirmed deficiency it is an effective treatment with a clear evidence base. The problem is the diagnostic threshold being stretched to fit the product.

## Using both together

This is well established and under-used. In hypogonadal men, testosterone supports the nitric oxide machinery that PDE5 inhibitors depend on — so men who previously got a poor response to tablets sometimes respond well once their testosterone is corrected.

- Both should be prescribed and monitored by the same clinician.
- Give testosterone three to six months before judging its effect on erections; libido responds sooner.
- Continue monitoring haematocrit and, where appropriate, PSA.
- Reassess whether you still need both after six months.

## Frequently asked questions

### Will testosterone fix my erectile dysfunction?

Only if you are genuinely deficient. In men with normal levels it does not improve erections and carries real risks including infertility and raised haematocrit.

### Can I take testosterone and Viagra together?

Yes, and in men with confirmed deficiency the combination often works better than either alone.

### What testosterone level is too low?

A total testosterone below roughly 300 ng/dL on two separate morning tests is commonly used as the threshold, but symptoms matter as much as the number and laboratory ranges differ.

### Does testosterone therapy affect fertility?

Yes — it suppresses sperm production, often to zero. If you may want children, ask about hCG or clomiphene instead, or bank sperm first.

## Sources

- American Urological Association. [Testosterone Deficiency: AUA Guideline](https://www.auanet.org/guidelines-and-quality/guidelines/testosterone-deficiency-guideline) (2018)
- Endocrine Society. [Testosterone Therapy in Men With Hypogonadism — clinical practice guideline](https://www.endocrine.org/clinical-practice-guidelines/testosterone-therapy) (2018)
- American Urological Association. [Erectile Dysfunction: AUA Guideline](https://www.auanet.org/guidelines-and-quality/guidelines/erectile-dysfunction-(ed)-guideline) (2018)
- U.S. Food and Drug Administration. [Drugs@FDA — approved drug products and prescribing information](https://www.accessdata.fda.gov/scripts/cder/daf/)

## Related pages

- [Testosterone Therapy for ED: When It Helps and When It Does Not](https://www.edtreatmentguides.com/treatments/testosterone-therapy)
- [Low Testosterone and ED: Sorting Signal From Marketing](https://www.edtreatmentguides.com/causes/low-testosterone)
- [ED and Fertility: Treating One Without Wrecking the Other](https://www.edtreatmentguides.com/guides/ed-and-fertility)
- [Thyroid Disorders and High Prolactin: The Blood Tests People Skip](https://www.edtreatmentguides.com/causes/thyroid-and-prolactin)

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_This page is general health information, not medical advice. It cannot account for your own history, medications or risk factors. Talk to a licensed clinician before starting, stopping or changing any treatment._

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