Stud 100 Desensitising Spray

What is Stud 100 Delay Spray?

Stud 100 is a topical treatment for premature ejaculation,  formulated as a metered-dose aerosol spray. Each 12g canister contains lidocaine 9.6% w/w, a well-established local anaesthetic, and delivers a consistent dose with every application. The spray is applied directly to the glans (head) of the penis, where it works on contact to temporarily reduce sensitivity in the area.

Stud 100 can be used whether or not a condom is worn, though it is worth noting that the spray should be allowed to absorb fully before penetrative sex to minimise any transfer to a partner. It is suitable for use with or without a partner and requires no advance planning beyond a short waiting period after application.

About Premature Ejaculation

Premature ejaculation is one of the most common male sexual health concerns, affecting men of all ages. It is generally defined as ejaculation that occurs sooner than a man or his partner would like, typically within one to two minutes of penetration, and is often accompanied by a reduced sense of control. Research from Bupa's 2025 Wellbeing Index found that around one in three men report having experienced premature ejaculation, and that poor mental health and workplace stress were among the most prominent contributing factors.

The condition can take a significant toll on confidence and emotional wellbeing. Around a third of men with sexual function issues go on to experience anxiety, stress, or frustration as a result, all of which can further affect intimate relationships. Despite how common it is, many men are reluctant to seek help. Stigma and harmful stereotypes deter a significant proportion of men from discussing sexual function concerns, with 34% citing fear of judgement or embarrassment as a barrier to seeking advice.

PE is a treatable condition, and effective options are available. Where symptoms are primarily physical, topical treatments such as Stud 100 offer a practical, discreet approach. However, PE can also have psychological roots. Performance anxiety, stress, and relationship difficulties are all recognised contributors, and in these cases, additional support such as cognitive behavioural therapy or psychosexual counselling may be beneficial alongside or instead of topical treatment. A GP can help determine the most appropriate approach.

How Does Stud 100 Work?

Stud 100 contains lidocaine 9.6% w/w, a well-established local anaesthetic that works by temporarily blocking sodium channels in nerve endings, preventing them from transmitting signals to the brain. When applied to the glans of the penis, this reduces localised sensitivity. It should not affect blood flow, libido, or arousal when used correctly. The result is a modest but meaningful reduction in stimulation, which can help delay ejaculation and allow for greater control during intercourse.

Importantly, lidocaine acts only at the site of application; only extremely low levels are absorbed systemically. This means it works locally rather than altering mood, sensation elsewhere in the body, or any other physiological process.

How Long Does Stud 100 Take to Work?

The desensitising effect of Stud 100 begins within 5 to 15 minutes of application. The spray should be applied to the head and shaft of the penis and allowed to absorb fully before intercourse. This absorption period is key to how well the product performs. The exact onset time can vary slightly between individuals depending on skin sensitivity and the number of sprays used, so it is worth allowing the full 15 minutes where possible, particularly when using the product for the first time.

Stud 100 Spray: How Long Does it Last?

The duration of Stud 100's effect depends on several factors, including the number of sprays applied, how thoroughly the product is absorbed before intercourse begins, and individual differences in skin sensitivity. As lidocaine acts only at the surface of the skin rather than systemically, its effects wear off naturally as the product is absorbed and dispersed; there is no abrupt cessation of effect.

It is worth noting that the maximum recommended dose is 24 sprays in any 24-hour period. Applying more than the recommended amount will not necessarily extend the duration and may increase the likelihood of unwanted effects such as excessive numbness or skin irritation.

Is Stud 100 Effective?

Stud 100 has been available for over 50 years and remains one of the most widely used topical treatments for premature ejaculation. Its active ingredient, lidocaine, has been the subject of a substantial body of clinical research, with multiple randomised controlled trials supporting its effectiveness in delaying ejaculation.

A 2023 systematic review and meta-analysis published in Cureus examined 11 randomised controlled trials involving 2,008 participants. The analysis found that topical lidocaine was significantly more effective than placebo in increasing intravaginal ejaculatory latency time (IELT), the clinical measure of how long it takes to ejaculate during intercourse. The same review also found that lidocaine gel outperformed both paroxetine and sildenafil in direct comparisons, suggesting that topical anaesthetics may compare favourably with other commonly used treatments for premature ejaculation.

A phase II randomised controlled trial conducted in the UK and the Netherlands assessed a metered-dose aerosol spray delivering a mixture of lidocaine and prilocaine, a formulation closely comparable to Stud 100 in both its delivery mechanism and active ingredients. The study found a statistically and clinically significant increase in IELT compared with placebo, alongside positive trends in ejaculatory control and sexual quality of life for both patients and their partners. The spray was considered easy to use by 83% of participants and was well tolerated, with only mild, transient local numbness reported in a small number of cases.

It is worth noting that individual responses to Stud 100 can vary, and the number of sprays applied, absorption time, and individual sensitivity will all influence outcomes. As with any treatment, it may take a small degree of trial and error to find the dose and timing that works best for you.

Stud 100 Spray: How to Use

Using Stud 100 correctly makes a meaningful difference to how well it performs. Allowing sufficient time for the spray to absorb before intercourse is particularly important, as applying it and proceeding immediately is one of the most common reasons the product underperforms. It is also worth taking a little time to find the dose that works for you, as sensitivity varies between individuals and the right number of sprays may differ from person to person.

• Apply 3 to 8 sprays to the head and shaft of the penis, 5 to 15 minutes before intercourse
• Always use the minimum effective amount for you
• Do not exceed 24 sprays in any 24-hour period
• Do not spray near the eyes or nostrils; this product is for external use only
• Do not use on broken, damaged, or inflamed skin
• Wash the spray off after intercourse
• Do not use for more than 3 months without consulting your doctor
• Use a condom to minimise the risk of transferring the spray to your partner.

Using Stud 100 is most effective when approached as a shared experience. Talking openly with your partner about application, timing, and any changes in sensation can help manage expectations and make the process feel more natural. If your partner notices reduced sensitivity despite allowing adequate absorption time, adjusting the number of sprays downward is worth trying before considering other options.

What if I Use Too Much Stud 100 Spray?

If you apply more than the recommended amount of Stud 100, seek prompt medical advice. While only very low levels of lidocaine are absorbed into the bloodstream under normal use, applying significantly more than the advised dose may increase absorption and, in rare cases, cause effects such as dizziness or nervousness.

On a practical level, too many sprays can cause excessive numbness, which may reduce sensation or make it harder to maintain an erection — another reason to start with the minimum effective dose. If you experience any unusual symptoms after use, stop and contact a healthcare professional.

What if I Forget to Use Stud 100 Delay Spray?

Because Stud 100 is an on-demand treatment used only when needed, there is no regular dosing schedule to follow, so there is no forgotten dose in the conventional sense. If you begin intercourse without applying the spray, it is best to pause and apply it at that point, allowing at least 5 minutes for the product to absorb before continuing.

Do not apply extra sprays to compensate. Using more than necessary will not improve effectiveness and may cause excessive numbness or discomfort. If you are finding it difficult to remember to apply the spray in advance, it may help to keep it somewhere easily accessible and factor in the absorption time when planning for intercourse.

Stud 100 Spray Safety and Side Effects

As with all medicines, it is important to read the following information before using Stud 100 delay spray.

Side Effects of Stud 100

All medicines carry the risk of side effects, though not everybody experiences them. The most commonly reported side effects with Stud 100 are localised reactions at the site of application, including skin irritation, redness, or a temporary burning sensation. If you or your partner develop a rash or irritation after use, stop using the spray immediately.

Using more than the recommended dose increases the risk of lidocaine being absorbed into the bloodstream. At significantly elevated blood levels, lidocaine has been associated with more serious effects including dizziness, nervousness, convulsions, loss of consciousness, and in rare cases, effects on the heart and lungs. This is why it is important to stick to the recommended dose of 3 to 8 sprays and not exceed 24 sprays in any 24-hour period. See the section above for further guidance on what to do if you use too much.

Stud 100 Allergic Reaction

Do not use Stud 100 if you are allergic to lidocaine or any other anaesthetic belonging to the amide group (Prilocaine or bupivacaine). The product also contains fragrance ingredients which may cause allergic reactions in some individuals.

If you or your partner experiences an allergic reaction to Stud 100, stop using the spray and inform your doctor or go straight to your nearest emergency department. Remember to take the packaging and any remaining medicine with you so doctors know exactly what you have taken and how much.

Stud 100 Delay Spray Warnings and Interactions

While Stud 100 spray is effective, it is not suitable for everyone. You should not use the treatment if:

• You are female
• Your partner is pregnant
• You have broken or inflamed skin in the area 
• You are allergic to lidocaine, other local anaesthetics or any other ingredients found in Stud 100

If you are planning for a baby, you should either avoid using Stud 100 desensitising spray altogether or thoroughly wash it off just before intercourse.

It is also worth bearing in mind that the product should not be used for longer than three months without consulting your doctor. Prolonged use without medical review may mean an underlying cause of premature ejaculation goes unaddressed. Prostate problems, thyroid dysfunction, and hormonal imbalances have all been associated with ejaculatory difficulties. If your symptoms persist or worsen despite regular use, speak to your GP to determine whether an underlying condition warrants its own treatment.

Stud 100 Precautions

You should speak to your doctor before using Stud 100 if you have, or have ever had, liver or kidney problems. As lidocaine is broken down by the liver, impaired liver or kidney function can affect how the body processes it, even at the low absorption levels associated with topical use. Anyone with a history of liver or kidney conditions should seek medical advice before using the product to ensure it is safe for them to do so.

Stud 100 is not recommended for use in elderly patients, and there is no relevant use in children or adolescents. Discontinue use if a rash or irritation develops, and consult a doctor if symptoms persist.

Stud 100 and Other Medications

While the amount of lidocaine absorbed from Stud 100 during normal use is very low, high blood levels of lidocaine can interact with other medicines. You should speak to your doctor or pharmacist before using Stud 100 if you are currently taking, or have recently taken, any other medicines, including herbal remedies or treatments obtained without a prescription. This is particularly relevant if you are taking SSRIs, as these are sometimes used in the management of premature ejaculation. Your doctor can advise on whether using both treatments together is appropriate for you.

Some men experience both premature ejaculation and erectile dysfunction concurrently, and may wish to use Stud 100 alongside an ED medication such as sildenafil or tadalafil. Research suggests this combination can be used safely in some cases - a randomised controlled trial found that combining tadalafil with a topical lidocaine spray was well tolerated in men with both conditions. However, combination use should only be considered under medical supervision. If this applies to you, speak to your doctor before using both treatments together. 

Frequently Asked Questions About Stud 100 Spray