Viagra vs sildenafil: What’s the difference between the...
Reviewed by Dr. Anup Jethwa
Both routes can be safe.
A face-to-face appointment adds a physical examination and blood tests.
A regulated online consultation adds privacy and convenience, with a UK-registered prescriber checking your answers before anything is prescribed.
For most men with straightforward erection problems, either works.
If you have pain, a new bend in the penis, heart symptoms, or treatment that hasn't worked, see a doctor in person.
If you've been putting this off, you're not alone.
Difficulty getting or keeping an erection is one of the most common health problems men have.
In Britain's national sex survey, about 13% of sexually active men aged 16 to 74 said they'd had trouble getting or keeping an erection, lasting three months or more, in the past year.
A long-running US study of men aged 40 to 70 found that around half of the men who participated in the study had some degree of erection problem.
Yet, many men wait a long time before asking for help.
In a 2022 charity poll of 1,000 UK men by The Urology Foundation, more than half said anxiety had stopped them from seeking treatment.
This guide walks through what actually happens in each type of consultation, step by step. No surprises, no awkward guesswork.
OnlineClinic has been operating since 2011 and has treated more than 2.1 million patients.
The pharmacy is registered with the General Pharmaceutical Council (GPhC), our prescribers are registered with the General Medical Council (GMC), and the service is regulated by the Care Quality Commission (CQC).
As of October 2026, on Trustpilot, the service rating is 4.6 out of 5 based on 7,114 reviews.
Occasional problems are usually tied to tiredness, stress, or alcohol. When it keeps happening, it's worth finding out why.
Guidelines from the British Society for Sexual Medicine (BSSM) and the European Association of Urology (EAU) link ongoing ED to:
There's also a well-established link with heart health.
The blood vessels in the penis are narrower than those supplying the heart, so they can show signs of trouble earlier.
An expert consensus published in the International Journal of Clinical Practice estimated that ED tends to appear 2 to 3 years before symptoms of heart disease.
Here's the good part
That early warning is useful. It gives you a head start on checking blood pressure, cholesterol, and blood sugar, all of which can be treated.
Many men find that looking after their general health helps their erections as well.
A face-to-face appointment is usually with your GP. Most of it is a conversation, followed by a few quick checks.
Expect questions such as:
Some doctors use a short scoring questionnaire called the IIEF (International Index of Erectile Function).
EAU guidelines recommend it to measure how things are now and track progress.
BSSM guidelines recommend a focused examination for men seeing a doctor about ED for the first time. That usually means:
The genital check takes a minute or two. You can ask for a chaperone, and you can say at any point if you'd like to stop.
Did you know?
Doctors talk about erections every week.
To them, it's a routine question, in the same category as sleep or blood pressure.
Most men say afterwards that the appointment was far less awkward than they'd expected.
BSSM guidelines recommend these for men newly seeking help with ED:
These help the doctor work out your overall heart risk.
If testosterone comes back low, our guide to testosterone and ED explains what happens next.
If treatment is suitable, the doctor can prescribe it at the appointment.
If needed, they can also refer you to a specialist, for example, a urologist for curvature or a hormone specialist for low testosterone.
A regulated online consultation covers the same ground in a different format.
The General Pharmaceutical Council (GPhC), which regulates UK pharmacies, tightened its rules for online services in February 2025.
Here's how ours works.
You fill in a confidential questionnaire. It takes around 5 to 10 minutes and covers:
The questions are thorough on purpose. Your medicine list matters most, because a few medicines must never be combined with ED tablets.
Safety check
ED tablets such as sildenafil and tadalafil must never be taken with:
Together they can cause a dangerous drop in blood pressure.
The safety information for sildenafil and tadalafil rules out nitrates, poppers, and riociguat.
Nicorandil's own safety information rules out taking it with ED tablets.
Alpha-blockers (medicines for high blood pressure or an enlarged prostate) need extra care, and a lower starting dose of ED medicine may be advised.
Quick tip
Keep your medicine boxes or repeat prescription list beside you while you fill in the questionnaire.
It makes your answers more accurate and saves time if the prescriber has a follow-up question.
A UK-registered prescriber reviews your answers before anything is prescribed. Under GPhC guidance, every regulated online service must:
If the prescriber needs more detail, they message you through your account.
Sometimes your answers point to something that needs examining or testing first. When that happens, the prescriber tells you why and suggests seeing your GP. You're not charged for treatment that isn't issued.
It can feel disappointing in the moment. But actually, it's the system doing its job.
With your permission, we let your GP know what you've been prescribed. GPhC guidance encourages this, so your medical record stays complete.
If the treatment is approved, it's dispensed by our GPhC-registered pharmacy and sent in plain, unbranded packaging.
Here's how the two routes compare on the things men most often ask about.
| Face-to-face appointment | Regulated online consultation | |
|---|---|---|
| How you're assessed | Conversation with a doctor in the room | Health questionnaire, plus messages with the prescriber |
| Physical examination | Yes, including blood pressure and a brief genital check | No. Relies on your answers |
| Blood tests | Can be arranged (blood sugar, cholesterol, testosterone) | Not usually. You may be advised to arrange them with your GP |
| Medicine safety check | Doctor reviews your conditions and medicines | Prescriber reviews your conditions and medicines |
| Privacy | Confidential, attended in person | Confidential, done from home, plain packaging |
| Follow-up | Continuity with a practice that knows your history | Messages and reorder reviews. Your GP is informed with your consent |
Two ED tablets are sold in UK pharmacies without a prescription, after a short private chat with the pharmacist:
Both are for men aged 18 and over.
The pharmacist won't supply them if you have serious heart problems, take nitrates, or have certain other conditions.
In those cases, they'll suggest seeing a doctor.
An online consultation suits many men, but not everyone. See a doctor in person if you have:
Our guide on when to see a doctor about ED covers these in more detail.
Worth knowing
An erection that lasts longer than 4 hours (priapism) needs urgent medical help. Go to A&E straight away, even if it feels embarrassing. Prompt treatment protects your long-term erectile function.
This is where an online route can go wrong, and it's nothing to do with regulated services.
In February 2026, the MHRA reported seizing around 19.5 million doses of illegal ED medicines between 2021 and 2025.
Yearly seizures have more than doubled since 2022.
The MHRA warned that these pills can contain no active ingredient, the wrong dose, or hidden and sometimes toxic substances.
0M1M2M3M4M5M6M4.6M20211.8M20223.2M20235.5M20244.4M2025 Doses of illegal ED medicines seized by the MHRA each year, in millions. Source: MHRA, February 2026.
Before ordering from any website, check that:
Be wary of social media sellers, messaging apps, "no questions asked" offers and prices that look too good to be true.
Did you know?
Website logos are no longer the best test.
The GPhC closed its voluntary internet pharmacy logo scheme at the end of 2025, and logos can be copied anyway.
Searching the official register yourself takes under a minute and is far more reliable.
There's no single right answer, and plenty of men use both.
A common pattern is to start online for privacy, then book a blood pressure check and blood tests with the GP.
Others start with their GP, find a treatment that suits them, then reorder online for convenience.
If anxiety is part of the picture, our guide to anxiety and ED may help, and so might our tips on talking to your partner about ED.
The most important step is the first one: Talking to a qualified professional rather than buying from an unknown website.
Our process is straightforward. From start to finish, this is what happens when you order with us:
Every price includes the prescription, the consultation, the packaging, and delivery. There are no hidden fees.
Operating since 2011
More than 2.1 patients treated
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Disclaimer
ED treatments are prescription-only or pharmacy medicines. Whether a treatment is suitable for you is decided by a registered prescriber based on your medical history. This article is general guidance and not a substitute for professional medical advice. If you have chest pain, or an erection lasting more than 4 hours, call 999 or go to A&E.
Reviewed by Dr. Anup Jethwa
Reviewed by Dr. Anup Jethwa
Reviewed by Dr. Anup Jethwa
Reviewed by Dr. Anup Jethwa
Reviewed by Dr. Anup Jethwa
Reviewed by Dr. Anup Jethwa
Not sure which treatment is right for you?
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