How Long Does Spedra 100mg Last? Onset, Duration and Timing Explained

Spedra is licensed to be taken approximately 30 minutes before you need it, and the maximum recommended dosing frequency is once daily. Those two figures answer almost every timing question, and both come from the NICE evidence summary. Spedra how long does it take to work has a published answer; how long does Spedra last does not, and the difference matters.

The duration question is harder, and this page is going to be straight with you about why. The NICE and MHRA guidance cited on this page does not provide a specific duration or half-life figure for avanafil. The relevant product information should be checked for the pharmacokinetic details of the medicine supplied to you.

That is not a gap in the evidence. It is a gap in what is publicly published by NICE and the MHRA. The figure exists in the Summary of Product Characteristics and the patient information leaflet supplied with your medicine, which are the authoritative documents for your specific product. This page will tell you what is verified, and point you to the leaflet for what is not.

One safety point before anything else, because it overrides every timing consideration. Never take Spedra alongside another erectile dysfunction tablet, at any interval. For technical and medical reasons, these two medications should not be used together, as they can react immediately. Timing does not make that combination acceptable, and there is a section explaining why.

Key things to know

• NICE states the currently approved timing is approximately 30 minutes beforehand.
• NICE states that "the maximum recommended dosing frequency is once daily". Never take two in 24 hours.
• NICE states that "if it is taken with food, the onset of activity may be delayed".
• A secondary trial analysis looked at attempts within 15 minutes of dosing, with 64 to 71% reported successful on avanafil against 27% on placebo.
• No half life, Tmax or duration figure for avanafil is published by NICE or the MHRA in accessible guidance. The patient information leaflet supplied with your medicine is the authoritative source.
• Never combine two erectile dysfunction medicines, whatever the gap between them.
• Alcohol both delays and works against the effect, and compounds the blood pressure drop.

How long does Spedra 100mg take to work?

Approximately 30 minutes, which is the licensed timing. The NICE evidence summary states that the currently approved indication is to take it approximately 30 minutes beforehand. The same answer applies to avanafil under any brand, since avanafil is the active ingredient.

That figure is the one to plan around. It is not a maximum wait or a guarantee of effect at exactly 30 minutes, but the timing the licence is written around and the point from which the medicine is expected to be active.

Avanafil has the shortest licensed lead time of the four PDE5 inhibitors discussed by NICE. That reputation is worth qualifying, though, because it rests partly on data that NICE itself treats carefully.

Spedra onset of action: the 30 minute figure

The 30 minute timing is the approved position, and NICE records that a change to it was under consideration.

At the time of its review, NICE noted that a submission was pending with the European regulator to evaluate the approved timing at approximately 15 minutes after dosing rather than 30. That submission reflects the argument that avanafil acts faster than the current licence describes.

What matters practically is that the approved timing is the one to follow. A pending regulatory submission is not a licence change, and this page does not treat it as one.

Spedra 100mg how long to kick in: what the 15 minute data showed

There is trial data on very early onset, and NICE reports it with a caveat that is worth reading.

NICE describes a secondary analysis in which 300 attempts were made within 15 minutes of dosing. Of those, 64 to 71% were reported successful in the avanafil groups compared with 27% in the placebo group.

That looks impressive, and the caveat is essential. NICE states that "the time from drug intake to the start of the [activity] was not well defined during the studies". In other words, the 15 minute figure comes from a secondary analysis of a measurement the trials were not designed to capture precisely.

So the honest reading is this. There is a signal that avanafil can act inside 15 minutes for some men. It is not strong enough for the regulator to have changed the licence on it at the time NICE reviewed it, and the approved timing remains approximately 30 minutes.

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How long does Spedra 100mg last?

This is where the page has to be honest rather than confident. No Spedra 100mg duration figure is published in the NICE or MHRA sources cited throughout this page, and the same applies to the question how long does avanafil last.

NICE publishes the onset timing and the dosing interval. It does not publish how many hours the effect lasts, and it does not publish a terminal half life, a time to maximum plasma concentration, an absorption or elimination profile, or a bioavailability figure for this medicine. Those pharmacokinetic figures are not provided in the NICE/MHRA guidance cited on this page.

Why this page does not give you a number of hours

Because inventing one would be exactly the failure that fills competing pages on this topic.

Search for how long Spedra lasts and you will find confident figures. Many of them are correct, because they come from the Summary of Product Characteristics. Some are wrong, because they have been copied from another medicine in the same class, and pharmacokinetics do not transfer between drugs. A half life belongs to one molecule. Attaching another medicine's number to avanafil is a common and serious error.

What you should do instead is straightforward.

• Read the patient information leaflet supplied with your medicine. It is specific to your product and it is the authoritative document.
• Ask your prescriber at the consultation. Timing and duration are exactly the sort of practical question a consultation is for.
• Treat any website figure with caution unless it names its source and that source is the product literature.

Spedra half life, and how long Spedra stays in your system

The same answer applies, and the terminology is worth defining because it is often confused.

Half life is the time taken for the amount of a medicine in the blood to fall by half. It is a pharmacokinetic measure of elimination, not a measure of how long an effect lasts.

How long a medicine stays in your system usually means the time to clear almost entirely, which is several half lives.

Duration of effect is different again, and is what most people actually mean when they ask. A medicine can still be detectable after the useful effect has gone.

Avanafil is metabolised in the liver, principally by the enzyme CYP3A4, which is why NICE contraindicates it alongside potent inhibitors of that enzyme such as ketoconazole or clarithromycin. Blocking CYP3A4 slows clearance, so more of the medicine stays in the system for longer.

That mechanism is verified. The specific numbers attached to it, for this medicine, are in the product literature rather than in NICE or MHRA guidance, and this page will not guess at them.

Does food affect how long Spedra lasts?

Food affects when it starts working. NICE states directly that "if it is taken with food, the onset of activity may be delayed".

That is a specific, sourced statement and it is the single most practical timing fact on this page. A substantial meal may delay the onset, so the medicine may take longer to start working.

Three practical points follow.

A heavy meal is the relevant variable, not eating at all. NICE describes a delay to onset rather than a loss of effect.

It changes when, not whether. The medicine is still absorbed. The timing of the start shifts.

Plan around it rather than skipping meals. If you have eaten substantially, allow longer than 30 minutes rather than concluding the tablet has not worked. Allowing more time after a substantial meal may help avoid judging the medicine too early.

NICE does not publish a figure for how much food delays onset with avanafil, so no number is given here.

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Spedra and alcohol timing

Alcohol can increase the risk of low blood pressure and can also make it harder to achieve an erection, particularly when consumed excessively.

NICE lists alcohol among the special warnings and precautions for avanafil, alongside alpha blockers, antihypertensive medicines and other erectile dysfunction treatments.

On safety: avanafil and alcohol both lower blood pressure, so the effects compound. That increases the chance of dizziness, flushing and fainting.

On effect: MHRA documentation states that "drinking excessive alcohol can temporarily reduce a man's ability to get an erection", by lowering blood pressure and dulling the nerve signal. So alcohol reduces the outcome the tablet is meant to produce.

The UK Chief Medical Officers' guidance, published in August 2016, states that "to keep health risks from alcohol to a low level it is safest not to drink more than 14 units a week on a regular basis". That is general health guidance rather than an instruction about this medicine, but it is a sensible reference point.

What Can Affect How Long Spedra Works?

Rather than lasting a fixed number of hours for everyone, Spedra's effect can vary between individuals. The timing of sexual stimulation, whether you have eaten a substantial meal, alcohol intake and the underlying cause of erectile dysfunction can all influence how well the medicine performs on a particular occasion.

A slower response does not necessarily mean the treatment has failed. If you've taken Spedra after a large meal, it may take longer to start working than its usual licensed lead time, and excessive alcohol can also make it harder to achieve an erection.

Why There Is not a Single "Duration" Figure

It is tempting to look for one number that answers "How long does Spedra last?", but the evidence is more nuanced. The NICE and MHRA guidance cited in this article provides clear information about when to take Spedra and how often it can be used, but it does not publish a single duration figure for how long its effects last in every person.

That is why it is more accurate to think of Spedra as a medicine with a predictable onset but a variable duration of effect, rather than expecting one fixed number to apply to everyone.

Important safety information

For technical and medical reasons, Spedra should never be used alongside another erectile dysfunction medication, as combining these medications can cause immediate and potentially dangerous reactions. This combination significantly increases the risk of side effects such as headache, flushing, nasal congestion, heart palpitations, and blurred vision.

Alcohol can increase the risk of dizziness and low blood pressure and may also make it harder to achieve an erection. Additionally, grapefruit juice should be avoided as it can interfere with the metabolism of avanafil, increasing the risk of side effects.

Common side effects of Spedra include headache, flushing, and nasal congestion. Serious side effects require immediate medical attention.

Following the guidance of a healthcare professional and obtaining Spedra through a reputable UK registered pharmacy ensures safe and effective use of this medication.

Spedra timing guide

Pulling the verified facts into one place. Everything in this table comes from NICE, and where NICE publishes nothing, the row says so.

That table is the honest state of the publicly available guidance. Four rows have answers and three point you to the leaflet, which is where those figures properly live.

Can you take Spedra twice in a day?

No. The NICE evidence summary states that "the maximum recommended dosing frequency is once daily".

That is a clear regulatory position and it does not have exceptions built into it. Taking another dose would exceed the recommended dosing frequency and could increase the risk of adverse effects.

Three things follow, and they cover the situations people actually find themselves in.

If the first tablet did not seem to work, do not take another. Side effect frequency is dose related, and doubling exposure increases the blood pressure effect and the priapism risk. An occasion that fell short is information for your prescriber.

If the timing was wrong, that is a timing problem rather than a dose problem. Taking it after a heavy meal, or judging it before 30 minutes had passed, are both common and both fixable without another tablet.

If it consistently does not work, that is a consultation. MHRA documentation for another medicine in this class states that anyone whose symptoms have not improved after several consecutive occasions, or whose difficulty worsens, should consult their healthcare provider. The same principle applies here.

Never take more than the prescribed amount in a day, and never double up to make up for an occasion that fell short.

For safety, avoid combining Spedra with other erectile dysfunction medications or ed medicines, as combining them can lead to serious drug interactions. This increases the risk of side effects such as facial flushing, nasal congestion, heart palpitations, and blurred vision sudden decrease. Spedra's active ingredient, avanafil, works by increasing blood flow to the blood vessels in the penis to help achieve and maintain an erection, but using more than one tablet or combining with other ed treatments can dangerously amplify these effects.

Additionally, avoid grapefruit juice while using Spedra, as it can interfere with the metabolism of the medication, potentially increasing side effects. If you are taking nitrates or other medications affecting blood pressure, Spedra should not be used due to the risk of severe hypotension.

If you experience any sudden decrease in vision or hearing, or persistent side effects, seek immediate medical attention. Using Spedra responsibly as a prescription medication and following guidance from your healthcare provider ensures generally safe and effective treatment for male erectile dysfunction ed.

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Why you must never take two erectile dysfunction medicines together

Do not combine Spedra with another ED medicine unless a specialist specifically advises you to do so. PDE5 inhibitors and other ED treatments can have overlapping effects on blood pressure and erectile tissue, so combining treatments may increase the risk of adverse effects without an established safety benefit.

Spacing the medicines several hours apart does not make the combination automatically safe. If Spedra is not working as expected or is causing side effects, speak to your prescriber about whether a different treatment or dose is more appropriate rather than adding another medicine yourself.

How Spedra's timing compares with other tablets

The four first line medicines do differ in timing, and this is one of the few axes on which a real comparison is possible.

Before the comparison, the necessary caveat. NICE states that "it is not known how avanafil compares to other PDE5 inhibitors", because no double or triple blind multicentre studies compare their efficacy. So the comparison below is about how they are taken, not about which works better.

The genuinely useful distinction is not which acts fastest. It is whether you want timing to be a factor at all. One medicine in this group comes in a daily form, which means no planning around a window. The others are taken on the occasion. That is a preference worth raising at the consultation, and it changes the choice more than a few minutes of onset difference.

Treatment suitability depends on an individual clinical assessment, and your prescriber will determine the appropriate treatment. No medicine in this group can be described as better than the others as a general statement.

How long does Spedra 200mg last?

The same answer applies to the 200mg strength: the NICE and MHRA guidance cited here does not provide a specific figure for how long the effects of avanafil last. It is therefore not accurate to say that Spedra 200mg lasts for a fixed number of hours.

What the available evidence does establish is that Spedra can be taken approximately 15 to 30 minutes before sexual activity, depending on the current product information, and the recommended maximum dosing frequency is once daily. The 200mg strength does not provide a longer duration simply because it is a higher dose.

The clinical trial data do show a somewhat greater improvement in erectile-function scores with 200mg than with 100mg. In the general population trial described by NICE, the improvement was 9.4 points with 200mg compared with 8.3 points with 100mg, while placebo improved by 2.9 points. This relates to the measured treatment effect, not to how many hours the medicine remains effective.

The appropriate strength is therefore a prescribing decision based on factors such as response, tolerability, other medicines and your overall health. A higher strength should not be used simply to try to extend the duration of action.

As with other PDE5 inhibitors, sexual stimulation is required for avanafil to produce an erection. If you are unsure whether the timing or strength is right for you, speak to your prescriber rather than taking an additional dose.

What changes how long it works for you

Several factors influence timing and effect, and knowing them prevents people from concluding too early that a treatment has failed.

• Food. NICE states onset may be delayed if taken with food. The clearest and most reliably sourced factor on this list.
• Alcohol. Reduces the effect and compounds the blood pressure drop.
• Other medicines. Potent CYP3A4 inhibitors slow clearance. Alpha blockers and antihypertensives affect blood pressure alongside it.
• The underlying cause of ED can affect treatment response. In the NICE evidence summary, response rates differed between the general population and men who had undergone prostate surgery, illustrating why results can vary between patient groups.
• How many times you have tried. If it does not work on one occasion, this does not necessarily mean the treatment will never work.
• Liver and kidney function. Severe impairment in either is a contraindication rather than a timing adjustment.

The one that catches most people is food. If a tablet appeared not to work after a large meal, timing rather than the medicine may be the explanation.

Red flags: when timing stops being the question

Seek urgent medical attention if any of the following happen after taking Spedra:

• An erection lasting more than four hours, known as priapism, whether or not it is painful
• Sudden loss of vision in one or both eyes.
• Sudden loss of hearing, with or without ringing or dizziness
• Chest pain, especially during or shortly after exertion
• Fainting, or dizziness severe enough to make you fall
• Signs of an allergic reaction, including swelling of the face, lips or throat, or difficulty breathing

For safety, never take Spedra together with another erectile dysfunction tablet or medicine from the same group. For technical and medical reasons, these two medications should not be used together, as they can react immediately and dangerously, increasing the risk of side effects such as headache, flushing, nasal congestion, palpitations, and blurred vision.

Spedra is available in three doses, 50mg, 100mg, and 200mg, and should not be taken more than once in 24 hours. Using more than one dose or combining it with other treatments can increase the likelihood and severity of side effects.

A generic avanafil option is also available, offering a similar effect to branded Spedra but often at a lower cost. However, always ensure you obtain medication from a reputable UK registered pharmacy to guarantee safety and authenticity.

If you experience any sudden decrease in vision or hearing, or other serious symptoms, seek immediate medical attention. Responsible use following your prescriber's guidance maximises Spedra's effectiveness and safety.

Speak to your prescriber, without urgency, if the medicine consistently does not work as expected, if side effects persist after it should have cleared, if you start any new medicine including a short course, or if you are considering changing anything about how you take it.

For the full side effect picture, including frequency bands and the complete interaction list, see our guide to Spedra 100mg side effects and safety.

To find out whether treatment is appropriate for you, you can check your eligibility for erectile dysfunction treatment through an online consultation with UK registered prescribers. EveryDayMeds is a GPhC registered pharmacy, and clinical assessment happens before supply.

Medical Disclaimer

This article is general information and does not replace personalised medical advice. It gives no dosing instructions and should not be used to self diagnose, self prescribe, self medicate, or to start, stop or change any medicine.

Timing information here describes the licensed position as published by NICE. It is not a complete account of the pharmacokinetics of this medicine. The patient information leaflet and Summary of Product Characteristics supplied with your medicine are the authoritative documents, and they should be read before you take anything.

Avanafil is a prescription only medicine. Suitability depends on an individual clinical assessment by an appropriately qualified prescriber, who will consider your medical history, current medicines and cardiovascular health. This medicine should only be used under the supervision of an appropriately qualified prescriber. Results vary between individuals.

Trial figures on this page describe averages across defined study populations and are not predictions for any individual.

Never take more than the prescribed amount of any medicine, never take an extra tablet to make up for one that did not appear to work, and never take two erectile dysfunction medicines together at any interval.

If you experience chest pain, an erection lasting more than four hours, sudden vision loss or sudden hearing loss, seek urgent medical attention.

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