Oral Medication (PDE5 Inhibitors)
The first thing we try, and for most men the last thing they need.
Sildenafil, tadalafil, vardenafil and avanafil remain the best-studied treatment for erectile dysfunction. Dosed and timed correctly, they work for the majority of men who take them.
- Onset
- 20–60 minutes
- Duration
- 4–36 hours
- Visits required
- One consultation
- Downtime
- None
01Overview
Erections are a vascular event. Arousal signals the arteries of the penis to relax and fill; a pressure seal traps the blood in place. PDE5 inhibitors do not create that signal — they stop the body from switching it off too soon, which is why they only work alongside genuine arousal.
Most men who arrive at our clinic having 'tried the pill and it didn't work' have in fact never had a fair trial. They were given a starting dose, took it after a heavy meal, expected it to act like a switch, and abandoned it after two attempts. Guideline literature suggests a drug should not be called a failure until a man has attempted it at maximum tolerated dose on at least six to eight separate occasions.
Our job at this stage is unglamorous: get the molecule right, get the dose right, get the timing right, and remove the things working against it — untreated hypertension, unaddressed sleep apnea, alcohol, or a medication cabinet that is quietly undermining the result.
02How it works
The mechanism, without the hand-waving.
- 01
Arousal releases nitric oxide
Nerve endings and the vessel lining release nitric oxide into the erectile tissue, which raises levels of a messenger molecule called cGMP.
- 02
cGMP relaxes smooth muscle
Relaxed arterial muscle allows blood to rush into the two sponge-like chambers of the penis, and the resulting pressure compresses the veins that would drain it.
- 03
PDE5 breaks cGMP back down
The enzyme phosphodiesterase type 5 clears cGMP and ends the erection. In many men it clears it faster or earlier than it should.
- 04
The drug slows that clearance
Blocking PDE5 lets the arousal signal persist long enough to produce and hold a functional erection. No arousal, no signal, no effect — which is why these are not aphrodisiacs.
03Candidacy
Who this is for — and who it is not.
Likely a good candidate
- Men with mild to moderate erectile dysfunction of vascular or mixed origin
- Men who have never had a properly supervised dose trial
- Men who want the least invasive option first
- Men with benign prostatic hyperplasia, who may benefit from daily tadalafil for both conditions
Cautions & contraindications
- Absolutely contraindicated with nitrates in any form — nitroglycerin, isosorbide, or recreational 'poppers' (amyl nitrite). The combination can cause a catastrophic drop in blood pressure.
- Requires careful review alongside alpha-blockers such as tamsulosin or doxazosin
- Needs cardiology clearance if you have unstable angina, uncontrolled arrhythmia, or a recent cardiac event
- Not appropriate for men with a history of non-arteritic anterior ischemic optic neuropathy
04 — Our protocol
What actually happens, step by step.
- 01
Cardiovascular and medication review
We confirm that sexual activity is safe for your heart and screen your full medication list for interactions — this step is not optional and not a formality.
- 02
Molecule selection
Short-acting agents suit planned intimacy; tadalafil's long half-life suits men who prefer spontaneity or want daily dosing. Food sensitivity and side-effect profile differ between them.
- 03
Supervised dose titration
We start at a sensible dose and escalate deliberately across repeat attempts, with your physician reviewing between rounds rather than leaving you to guess.
- 04
Escalate only if warranted
If a genuine maximum-dose trial fails, that is clinically meaningful information — and it points us toward the next tier of treatment rather than more of the same.
05Risks & side effects
The part other clinics put in a footnote.
You cannot consent to something you have not been told about. Your physician will go through all of this with you again in person, and answer every question you have about it.
- Headache, facial flushing and nasal congestion are common and usually fade with continued use
- Indigestion and back or muscle ache, more often with tadalafil
- Transient blue-tinged or light-sensitive vision, more often with sildenafil
- Rarely: sudden hearing or vision change, or a prolonged erection — both require urgent care
Will I need these forever?
Not necessarily. When erectile dysfunction is driven by something reversible — poor glycemic control, untreated sleep apnea, a medication side effect, deconditioning, or a period of high stress — treating the underlying cause can restore function on its own. We look for those causes rather than assuming a permanent prescription.
Are the generics as good as the brand?
Generic sildenafil and tadalafil contain the identical active molecule and must meet FDA bioequivalence standards. We prescribe generics from licensed pharmacies by default. What we caution against is unregulated online product — analyses of seized 'herbal' supplements routinely find undeclared PDE5 inhibitors at unpredictable doses.
Why did it not work when my friend said it changed his life?
Common reasons: the dose was too low, it was taken with a heavy or fatty meal, it was taken without sufficient time to absorb, arousal was absent, alcohol was involved, or the underlying problem is not purely vascular. Each of those is diagnosable and most are fixable.
Important
The information on this website is provided for general education and does not constitute medical advice, diagnosis, or treatment. Erectile dysfunction can be the first sign of cardiovascular disease, diabetes, or hormonal disorders. Always consult a licensed physician about your individual circumstances, and never start, stop, or change a prescription based on what you read here.
Next step
Find out whether oral medication is right for you.
Candidacy for every treatment on this site is decided by assessment, not by a questionnaire. Start with the consultation and let the findings choose.