Erectile dysfunction (ED) is one of the most common reasons men in the UK seek medical help, and also one of the most under-discussed. It affects men of all ages, is rarely talked about openly, and is very often treatable. This guide sets out what ED is, when it’s worth seeking help, the main prescription treatments available, Sildenafil (generic Viagra), Viagra, Tadalafil (generic Cialis), Cialis, and Avanafil, how they compare, and what to check before buying any ED medicine online.

Quick answer

What ED is

Erectile dysfunction is the persistent difficulty getting or maintaining an erection firm enough for sexual activity. Occasional difficulty is common and not usually a cause for concern, but ongoing or worsening problems are worth discussing with a healthcare professional. ED can result from physical causes, such as reduced blood flow, hormonal changes, or nerve-related issues, psychological factors like stress, anxiety, or relationship difficulties, or, very often, a combination of both.

ED can also be an early warning sign of an underlying health condition. Because the same blood vessels affected in erectile dysfunction are also involved in cardiovascular health, ED sometimes appears before other symptoms of conditions such as high blood pressure, high cholesterol, or heart disease become obvious. This is one of the reasons a proper assessment matters, rather than simply treating the symptom in isolation.

ED becomes more common with age, but it is not an inevitable part of getting older, and it affects plenty of younger men too, often linked to stress, anxiety, or lifestyle factors rather than an underlying physical condition. Other contributing factors can include smoking, excess alcohol intake, obesity, poorly controlled diabetes, low testosterone, certain prescribed medicines, and pelvic surgery or injury. Because there are so many possible contributing factors, working through them with a prescriber, rather than assuming a single cause, gives you a much better chance of finding an approach that actually helps.

When treatment may be suitable

Treatment may be worth considering if you’re experiencing ongoing difficulty achieving or maintaining an erection, particularly if this has persisted for several weeks or is affecting your confidence, relationships, or general wellbeing. As part of a consultation, a prescriber will typically ask about:

• How long you’ve experienced symptoms and how often they occur.
• Your general health, including heart, blood pressure, and diabetes history.
• Current medicines, particularly nitrates, as these interact seriously with ED tablets.
• Lifestyle factors such as smoking, alcohol use, stress, and sleep.
• Any relevant psychological factors, such as anxiety or relationship stress.

Lifestyle changes, such as stopping smoking, reducing alcohol intake, managing stress, and improving sleep, can sometimes help alongside or instead of medication, and a prescriber may discuss these too. Suitability for a specific medicine is always assessed individually rather than assumed.

It’s also worth seeking a routine assessment sooner rather than later if ED appears suddenly, is severe, or is accompanied by other new symptoms, such as chest discomfort, unusual fatigue, or changes in urination, since these patterns can sometimes point toward a health issue that benefits from earlier investigation. Bringing up ED with a healthcare professional, even briefly, is a normal and common part of many men’s health conversations, and prescribers are used to discussing it without judgement.

Available treatment options

All of these belong to a class of medicines called PDE5 inhibitors, which work by relaxing blood vessels in the penis, allowing more blood flow during sexual stimulation. None of them cause an automatic erection; sexual arousal is still required for any of them to work. Full clinical detail, including dosing, ingredients, and warnings, is available on the individual product pages: Sildenafil, Viagra, Tadalafil, Cialis, and Avanafil.

Choosing between the as-needed options and the daily Cialis option often comes down to how often you’re sexually active and how much you want treatment to fade into the background of your routine. As-needed tablets suit men who prefer to plan around specific occasions, while a daily low-dose tablet suits men who would rather not think about timing at all and are comfortable taking a tablet every day regardless of whether it’s needed that day. Both approaches are valid, and a prescriber can talk through which fits your circumstances better.

Comparison table

Prices and product details were checked against The Care Pharmacy’s website at the time of writing and may change. Always confirm current pricing on the relevant product page before ordering.

Safety and suitability

All ED tablets covered here are prescription-only medicines (Viagra Connect is a lower-dose, pharmacist-supervised exception available without a full prescription for men who meet strict suitability criteria). A prescriber must assess your health before dispensing any of them. They are generally not suitable if you:

• Take nitrate medicines for chest pain, or recreational drugs such as amyl nitrite (“poppers”), due to a serious interaction risk.
• Have significant heart disease, very low or uncontrolled high blood pressure, or a recent stroke or heart attack.
• Have certain liver or kidney conditions, or specific inherited eye disorders.
• Have been advised to avoid sexual activity for medical reasons.

Always disclose your full medical history and current medicines during your consultation, including over-the-counter products and supplements, since interactions aren’t always obvious.

Some men also take more than one health condition into consideration when discussing ED treatment. For example, men managing benign prostatic hyperplasia (BPH), an enlarged prostate causing urinary symptoms, may find that Tadalafil, which is licensed for both ED and BPH, offers a practical option, since it can help address both concerns with a single, lower daily dose. This is exactly the kind of detail worth raising during your consultation rather than assuming which product applies to your situation.

Side effects and when to seek help

Common side effects across these medicines include headache, flushing, indigestion, nasal congestion, and dizziness. These are usually mild and temporary.

If a medicine doesn’t seem to work the first time, it’s not unusual; some men need a few attempts, and sexual stimulation is still required for any of these medicines to have an effect. If it consistently doesn’t work, speak to your prescriber rather than increasing the dose yourself, since taking more than the prescribed amount does not improve results and increases the risk of side effects.

Alcohol and heavy meals can also affect how well these medicines work. Drinking to excess can make it harder to get or keep an erection and can increase the risk of dizziness or low blood pressure, while a large, high-fat meal shortly before taking a short-acting tablet can delay how quickly it starts working. None of this means occasional alcohol or food needs to be avoided entirely, but it’s worth bearing in mind if a dose doesn’t seem to work as expected.

Buying safely online in the UK

ED medicines are among the most commonly counterfeited medicines sold online. Before buying, check that:

• The pharmacy is GPhC registered — verify this on the General Pharmaceutical Council register.
• You’re asked genuine health questions before any medicine is approved, not simply taken straight to checkout.
• The medicine is dispensed by a UK-registered pharmacist, with a patient information leaflet included.
• Pricing is transparent, with no hidden fees appearing after checkout.

The MHRA Yellow Card scheme allows anyone to report suspected side effects or suspicious, falsified medicines, which is only useful if your medicine came from a legitimate pharmacy in the first place.

Be particularly cautious of websites offering ED medicines with no questions asked, unusually low prices compared to the rest of the market, or vague, unbranded packaging in photos. Genuine ED medicines dispensed by a UK pharmacy will always come with a patient information leaflet and clear labelling, and your pharmacy should be reachable if you have questions after your order arrives.

Why choose The Care Pharmacy

The Care Pharmacy is a GPhC-registered UK pharmacy with branches in Bradford (GPhC: 9010308) and Lowmoor (GPhC: 1039449), each overseen by a named Superintendent Pharmacist. Our erectile dysfunction service is built around:

• Clinically led: every order is reviewed by a UK prescriber before dispensing.
• Transparent pricing: costs are shown upfront on our product and condition pages.
• Fast, discreet delivery: orders are dispatched in plain packaging, with next-day options where available.
• Support beyond checkout: our pharmacy team is contactable if you have questions before or after your order.

Explore our full range of treatments on the all conditions page, or browse the online pharmacy shop. If ED is linked to other men’s health concerns, such as low energy or reduced libido, it’s also worth exploring our related guidance on premature ejaculation and general men’s health support.

Frequently asked questions

View our frequently asked questions and answers below: