Medical note: This is general information, not personal medical advice. A doctor or pharmacist can help decide whether tadalafil is suitable and which schedule is appropriate.
What is tadalafil?
Tadalafil is a medicine used for erection problems. It increases blood flow to the penis during sexual stimulation. It does not create an automatic erection and it does not increase sexual desire.
What does on-demand treatment mean?
On-demand tadalafil is taken before anticipated sexual activity. The NHS notes that some people are advised to take a tablet at least 30 minutes before sex. Its effects can last for up to 36 hours, but this does not mean an erection lasts for that whole period.
On-demand use may suit people who have sex less often or prefer not to take a medicine every day. The exact dose should be agreed with a doctor or pharmacist.
What does daily treatment mean?
Daily tadalafil uses a lower dose taken at about the same time each day. This can reduce the need to plan a tablet around sexual activity. It may be considered for some people who expect frequent sexual activity, but it is not automatically the best choice for everyone.
Daily treatment also means continuous exposure to the medicine. A clinician should review other medicines, health conditions, side effects and whether regular treatment is needed.
Which approach is better?
Neither schedule is best for every person. The choice can depend on frequency of sexual activity, side effects, other health conditions, convenience, cost and personal preference. A clinician may also consider whether erection problems could be linked to diabetes, high blood pressure, high cholesterol, hormone problems or psychological factors.
Food, alcohol and grapefruit
Tadalafil can usually be taken with or without food. The NHS advises avoiding grapefruit juice while taking it. Drinking alcohol can increase the risk of low blood pressure, dizziness and light-headedness, and heavy drinking can itself make erections more difficult.
Important interactions
Tadalafil must not be used with nitrate medicines for chest pain. It should not be combined with poppers containing amyl nitrite. Other medicines for blood pressure, an enlarged prostate, fungal infections, HIV, epilepsy and some antibiotics may also interact.
Do not combine tadalafil with sildenafil or another erection medicine unless a qualified clinician has specifically instructed you to do so.
When to get help
Seek urgent medical advice for chest pain, sudden changes in hearing or vision, a serious allergic reaction or a prolonged or painful erection. If erection problems keep happening, arrange a GP or sexual health clinic review because they can sometimes be a sign of another treatable condition.
How long does tadalafil stay active?
Tadalafil is often described as a long-acting medicine. With an on-demand dose, the opportunity for a response may remain for up to 36 hours. This is a treatment window, not a continuous erection. Sexual stimulation is still necessary, and the response may vary from one occasion to another.
Daily dosing aims to maintain a steadier amount of medicine in the body. It may take several days to reach a stable level. Taking more tablets will not make that process happen safely or guarantee a better result.
What happens if a daily dose is missed?
Follow the leaflet and the advice supplied with the prescription. NHS guidance says to take a missed daily dose when remembered unless it is nearly time for the next one. In that situation, skip the missed dose. Never take two doses together to make up for a forgotten tablet.
Someone who regularly forgets doses may find that an on-demand schedule is easier, while another person may prefer the routine of a daily tablet. This is a practical discussion to have with a prescriber rather than a reason to change the schedule alone.
Side effects and review
Common side effects can include headache, flushing, indigestion, muscle aches, a blocked nose and dizziness. They are often mild, but persistent or troublesome effects should be discussed with a pharmacist or doctor. A lower dose or different treatment may sometimes be more suitable.
Why a regular health check matters
Erection problems can be connected with circulation, diabetes, blood pressure, cholesterol, hormones, stress or anxiety. Treating the symptom without checking possible causes may miss a condition that can be managed. The NHS advises people who buy tadalafil without a prescription to arrange a doctor’s check-up within six months of starting it.
A review is also useful if the medicine stops working, is needed more often, or if general health or prescribed medicines have changed. Bring a complete list of medicines, including supplements and recreational drugs, so interactions can be assessed accurately.
Summary
- On-demand tadalafil is taken before sexual activity.
- Daily tadalafil is a lower dose taken regularly.
- The correct schedule depends on individual circumstances.
- Do not take more than one dose a day.
- Never use tadalafil with nitrates or poppers.
For more information, see the NHS tadalafil guidance.