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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesErectile dysfunction medicines such as sildenafil and tadalafil can improve blood flow to the penis and help some people get or keep an erection during sexual activity. They do not work for everyone, can cause side effects, and may interact dangerously with medicines such as nitrates. Recurring erection problems are also worth discussing with a qualified clinician because they can be linked to other health conditions.
How do erectile dysfunction drugs work?
Sildenafil, tadalafil, vardenafil and avanafil belong to a group called PDE-5 inhibitors. They increase blood flow to the penis, which can make it easier to get and maintain an erection during sexual activity. They do not automatically cause an erection or restore sexual desire, and a helpful result is not guaranteed.
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The NHS says treatment can usually help improve erectile dysfunction, but whether a medicine is suitable and effective depends on the person and what is contributing to the problem. The information here reflects UK NHS and NHS Inform patient guidance; prescribing rules, availability and recommended care differ by country.
What is the difference between sildenafil and tadalafil?
Both are PDE-5 inhibitors, but their general use instructions and the time their effects may last differ. These are descriptions from NHS patient guidance, not personal dosing instructions: follow your own prescription and the medicine leaflet.
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| Medicine | General timing described in NHS guidance | What the guidance says about duration |
|---|---|---|
| Sildenafil | People with ED are usually instructed to take a tablet about an hour before sex. | Not stated in the NHS sildenafil guidance summarized here. |
| Tadalafil | For some people, use is described about 30 minutes before sex. | Effects can last up to 36 hours. |
The longer window described for tadalafil does not mean an erection lasts that long. Neither medicine is universally better; suitability, other medicines, health conditions and side effects all matter.
What are the side effects of sildenafil and tadalafil?
Sildenafil
Commonly reported effects include headache, dizziness, a stuffy nose, indigestion or nausea, and temporary changes in vision.
Tadalafil
Commonly reported effects include headache, flushing, a stuffy nose, indigestion, and muscle or back pain.
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Side effects vary between people. The medicine leaflet explains the effects to watch for and what to do; ask a pharmacist or clinician if you are unsure whether a symptom could be related to treatment.
Which symptoms need urgent attention?
NHS medicine guidance lists serious possible effects including an allergic reaction, chest pain or other heart symptoms, fainting or seizures, sudden problems with sight or hearing, and a prolonged, painful erection. These are not ordinary expected effects. If a serious symptom occurs, follow local emergency guidance and the instructions in the medicine leaflet.
Can I take erectile dysfunction medicine with nitrates?
Nitrates used for chest pain, including glyceryl trinitrate (GTN), are a major safety concern with sildenafil and tadalafil. NHS guidance says these medicines are not usually prescribed together. Do not start an ED medicine without telling the prescriber or pharmacist about nitrates and every other medicine or supplement you use.
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Other possible interactions include some medicines for blood pressure or pulmonary hypertension, certain antibiotics and antifungals, HIV treatments, and other ED or prostate medicines. This is not a complete interaction list. Tadalafil guidance also flags alcohol-related low blood pressure and grapefruit juice. Have a clinician or pharmacist check your full medication list rather than relying on a short list of examples.
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Who should get medical advice before using these medicines?
Some health conditions can affect whether an ED medicine is appropriate. NHS sildenafil guidance flags issues that may matter, including a recent heart attack or stroke, low blood pressure or uncontrolled high blood pressure, liver or kidney problems, certain blood disorders, and past vision loss linked to reduced blood flow to the optic nerve. Tadalafil guidance also notes interactions and other health-related cautions.
These examples are not a complete contraindication checklist. A clinician needs to assess your circumstances against current product information. The suitability of sexual activity itself can also depend on a person’s health.
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Why recurring erection problems deserve assessment
Occasional difficulty can happen with stress, tiredness or alcohol. Repeated difficulty getting or keeping an erection long enough for sex is worth discussing with a GP or another qualified clinician, rather than treating only the symptom.
Possible contributors include high blood pressure, high cholesterol, diabetes, depression or anxiety, hormone problems, stress, tiredness, alcohol, and side effects from medicines. Physical, psychological and medicine-related factors can overlap. Do not stop a prescribed medicine on your own; ask the prescriber whether it could be contributing and what alternatives are safe.
An assessment can help identify a contributing condition or medicine and guide treatment. This matters because a pill may not address the cause of ED.
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What alternatives or additional treatments are available?
The right option depends on the cause, health history and preferences. NHS and NHS Inform guidance describes several routes that may be considered:
- Address a contributing condition: care may focus on a health problem linked to ED.
- Review a possible medicine cause: a prescriber can advise whether a treatment should be changed; do not make the change yourself.
- Lifestyle changes: these may be relevant when health or habits contribute to the problem.
- Counselling or therapy: this may help when emotional or mental health factors are involved.
- Vacuum pump: a device that encourages blood flow may be an option if medicine is unsuitable or does not work.
None of these options is right for everyone, and more than one factor may need attention.
How can you reduce the risk of unsafe online medicines?
The NHS warns that ED medicines bought online may be fake or unregulated, with ingredients that can vary. In the UK, its advice is to check the relevant pharmacy and care-provider registrations. In other countries, use the official register of the national regulator. A medicine obtained outside regulated channels may not contain what its packaging claims, so discuss safe access with a qualified clinician or pharmacist.
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