Differin

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Differin on Prescriptsy

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Differin is a topical retinoid containing adapalene 0.1%, licensed in the United Kingdom for the treatment of mild to moderate acne vulgaris.

It is available as a gel or cream and is applied once daily to the affected area.

Differin works by normalising skin cell turnover within the hair follicle, preventing the formation of blocked pores (comedones), and reducing the inflammatory component of acne.

It is manufactured by Galderma and has been available in the UK since the late 1990s.

Adapalene is also available as a generic preparation and in combination with benzoyl peroxide (Epiduo).

Acne vulgaris is the most common skin condition in the United Kingdom, affecting an estimated 95% of young people between the ages of 11 and 30 to some degree.

While mild acne often responds to over-the-counter treatments containing benzoyl peroxide or salicylic acid, many patients require prescription-strength therapy.

Topical retinoids are considered a cornerstone of acne treatment by the British Association of Dermatologists (BAD) and NICE Clinical Knowledge Summaries, and adapalene is the best-tolerated and most widely prescribed retinoid in UK primary care.

This page provides a comprehensive clinical overview of how Differin works, who it is suitable for, how to use it correctly, expected timelines, side effects, safety warnings, and how to obtain a prescription.

Important safety information about Differin

Before reading further, note the following essential safety points. Differin is a prescription-only medicine (POM) in the United Kingdom and should be used under medical guidance.

• Differin must not be used during pregnancy. Retinoids are teratogenic. If you are pregnant or planning pregnancy, do not start treatment.
• Adapalene increases skin sensitivity to sunlight. Apply broad-spectrum sunscreen (SPF 30 or higher) every morning during treatment and avoid sunbeds.
• Mild irritation (dryness, redness, peeling) is expected during the first 2 to 4 weeks. This is normal and usually settles with continued use.
• Apply Differin to the entire acne-prone area, not just individual spots, once daily in the evening.
• Do not use Differin on broken, sunburnt, or eczematous skin.

Understanding acne vulgaris

Acne develops when hair follicles become blocked by a combination of excess sebum (oil), dead skin cells, and the proliferation of Cutibacterium acnes bacteria.

The initial lesion is the microcomedone, a microscopic blockage within the follicle that is invisible to the naked eye.

Over time, microcomedones enlarge to form visible comedones: open comedones (blackheads) and closed comedones (whiteheads).

When bacteria proliferate within a blocked follicle, the immune system responds with inflammation, producing papules (red bumps), pustules (spots with pus), and in severe cases nodules and cysts.

Several factors contribute to acne development. Hormonal changes during puberty, the menstrual cycle, and polycystic ovary syndrome increase sebum production.

Genetic factors influence sebaceous gland activity and the skin's inflammatory response. Certain medications, including corticosteroids and some hormonal preparations, can trigger or worsen acne.

Contrary to popular belief, diet and hygiene play only a minor role in most cases, though high-glycaemic diets and dairy intake have been linked to acne in observational studies.

Because acne begins at the microcomedone stage, effective treatment targets this early phase of the disease. This is the primary reason topical retinoids, which prevent microcomedone formation, are considered foundational in acne management.

How Differin works: mechanism of action

Adapalene is a third-generation naphthoic acid derivative that acts as a selective agonist at retinoic acid receptor subtypes RAR-beta and RAR-gamma.

These receptors are expressed in keratinocytes lining the hair follicle.

When adapalene binds to these receptors, it modulates the expression of genes controlling keratinocyte differentiation and proliferation, normalising the process by which dead skin cells are shed from the follicular lining.

In acne-prone skin, keratinocytes become abnormally cohesive (a process called retention hyperkeratosis), sticking together and forming a plug.

Adapalene reverses this process, keeping the follicle open and preventing comedone formation.

In addition to its comedolytic action, adapalene has intrinsic anti-inflammatory properties that distinguish it from older retinoids.

It inhibits the lipoxygenase pathway and the oxidative metabolism of arachidonic acid, reducing the production of inflammatory mediators including leukotriene B4 and prostaglandins.

It also inhibits toll-like receptor 2 (TLR-2)-mediated inflammatory responses in keratinocytes. These combined anti-inflammatory effects reduce the redness, swelling, and soreness associated with inflammatory acne lesions.

A further advantage of adapalene is its chemical and photostability. Unlike tretinoin, which degrades rapidly in the presence of ultraviolet light and benzoyl peroxide, adapalene remains active.

This means it can be used alongside benzoyl peroxide without loss of efficacy, and it retains its activity even with incidental light exposure during application.

Clinical evidence and UK prescribing guidance

Adapalene 0.1% has been evaluated in numerous randomised controlled trials.

A pivotal 12-week study comparing adapalene 0.1% gel with tretinoin 0.025% gel found similar efficacy in reducing both comedonal and inflammatory lesion counts, with significantly less skin irritation in the adapalene group.

Subsequent meta-analyses have confirmed that adapalene offers a favourable balance of efficacy and tolerability among topical retinoids.

NICE Clinical Knowledge Summaries on acne vulgaris recommend a topical retinoid (adapalene or tretinoin) as a first-line prescription treatment for mild to moderate comedonal acne, and as part of combination therapy (with a topical antibiotic or benzoyl peroxide) for mild to moderate inflammatory acne.

The BAD guidelines similarly position topical retinoids as a mainstay of treatment across acne severities.

The combination of adapalene with benzoyl peroxide (available as Epiduo) has been shown to provide additive benefit, reducing inflammatory lesions more effectively than either component alone.

NICE recommends considering a fixed-dose combination product for convenience and to reduce antibiotic use. Current UK prescribing trends favour adapalene over tretinoin due to better tolerability and stability.

How to use Differin correctly

Cleanse the skin with a gentle, non-soap cleanser and pat dry thoroughly.

Wait a few minutes to ensure the skin is completely dry, as applying retinoids to damp skin can increase irritation.

Apply a pea-sized amount of Differin gel or cream to the entire acne-prone area, not just individual spots.

Spread the product evenly across the forehead, each cheek, the nose, and the chin using clean fingertips.

Apply Differin once daily in the evening. This minimises UV exposure during the period of peak drug activity on the skin surface.

Avoid the eye area, lips, corners of the nose, and any areas of broken or eczematous skin. If the product contacts your eyes, rinse immediately with warm water.

During the first 2 to 4 weeks, a temporary worsening of acne may occur.

This is sometimes called a retinoid flare or purging, and it happens because adapalene accelerates the turnover of microcomedones already developing beneath the skin.

These lesions would have surfaced eventually, but adapalene brings them forward. This phase is a sign that the treatment is working at the follicular level.

Continue using Differin through this period; the flare typically resolves within 4 weeks.

Clinical improvement is usually visible after 4 to 8 weeks, with full therapeutic benefit at approximately 12 weeks. If no improvement is seen after 12 weeks of consistent daily use, consult your prescriber to reassess the treatment plan.

Skincare during Differin treatment

Use a gentle, fragrance-free, non-comedogenic moisturiser daily to manage retinoid-related dryness. Apply moisturiser after Differin has absorbed (wait approximately 20 minutes) or in the morning.

Apply a broad-spectrum sunscreen with SPF 30 or higher every morning, even on cloudy days, as adapalene-treated skin is more susceptible to UV damage.

Avoid harsh scrubs, alcohol-based toners, astringents, and strong chemical exfoliants (such as glycolic acid peels) while using Differin, as these can compound irritation.

Who can and cannot use Differin

Differin is suitable for adults and adolescents aged 12 years and over with mild to moderate acne vulgaris. It is appropriate for comedonal acne (predominantly blackheads and whiteheads), inflammatory acne (papules and pustules), and mixed acne presentations.

Differin should not be used by individuals who are allergic to adapalene or any excipient in the formulation.

It must not be used during pregnancy (retinoids are teratogenic), and women of childbearing potential should use effective contraception.

Breastfeeding mothers should avoid applying Differin to the chest area and discuss usage with their prescriber. Differin should not be applied to broken, sunburnt, or eczematous skin.

Side effects of Differin

Common side effects

Local skin reactions are the most frequently reported side effects and are an expected part of the retinoid response.

They include dryness, erythema (redness), scaling or flaking, and a burning or stinging sensation on application.

These effects are most pronounced during the first 2 to 4 weeks of treatment and generally diminish as tolerance develops.

Using a non-comedogenic moisturiser and starting with every-other-day application can help the skin adjust.

Uncommon and rare side effects

Uncommon effects include contact dermatitis, pruritus (itching), sunburn, and skin discomfort.

Rarely, patients may experience eyelid swelling or irritation if the gel migrates to the periorbital area, worsening of acne that does not settle beyond the initial 4-week adjustment period, or allergic reactions such as urticaria.

Very rarely, skin discolouration (hyper- or hypopigmentation) has been reported, particularly in patients with darker skin tones.

When to seek medical advice

Contact your GP or pharmacist if you experience severe, persistent, or worsening irritation that does not settle after reducing the frequency of application.

Seek urgent medical attention if you develop signs of a severe allergic reaction including widespread rash, swelling of the face, lips, or throat, or difficulty breathing.

Report any suspected adverse reactions via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk .

Warnings and precautions

Pregnancy and contraception

Retinoids are teratogenic.

Although systemic absorption of topical adapalene is minimal (less than 4% of the applied dose reaches the bloodstream), Differin is contraindicated in pregnancy as a precautionary measure.

Women of childbearing potential must use reliable contraception during treatment. If pregnancy is suspected, discontinue Differin immediately and consult your GP.

Sun exposure and photosensitivity

Adapalene-treated skin has a reduced barrier to ultraviolet radiation. Apply broad-spectrum sunscreen (SPF 30 or higher) every morning and reapply after prolonged outdoor exposure.

Avoid sunbeds, sunlamps, and excessive sun exposure. If significant sunburn occurs, pause treatment until the skin has fully recovered.

Drug interactions

Avoid using Differin at the same time as other topical retinoids, benzoyl peroxide at concentrations above 5% without prescriber guidance, or strong exfoliating products.

Adapalene is chemically stable with benzoyl peroxide, but applying both at the same time may increase irritation; use them at different times of day (benzoyl peroxide in the morning, adapalene in the evening).

Topical antibiotics such as clindamycin can be used concurrently by applying at different times.

Differin compared with other topical retinoids

Three topical retinoids are used in UK acne practice: adapalene, tretinoin, and isotretinoin gel. Adapalene is the most widely prescribed because of its superior tolerability.

Comparative studies show that adapalene 0.1% produces less irritation than tretinoin 0.025% while delivering equivalent efficacy. Adapalene's photostability means it does not degrade in light, unlike tretinoin.

Topical isotretinoin gel (Isotrex) is an alternative but is less commonly prescribed and can also cause significant irritation.

For patients who do not respond to topical retinoids and topical or oral antibiotics, oral isotretinoin (Roaccutane) may be considered.

This is a highly effective systemic retinoid reserved for severe or scarring acne and is prescribed exclusively under dermatology supervision due to its significant side-effect profile, including teratogenicity, mood effects, and lipid changes.

How to get a Differin prescription in the UK

Differin is a prescription-only medicine. Your GP can prescribe it following a clinical assessment of your acne.

Many GPs prescribe adapalene as a first-line topical retinoid for mild to moderate acne.

If acne is moderate to severe, your GP may refer you to an NHS dermatologist for further assessment and treatment options including combination therapies or oral treatments.

Authorised online prescribers registered with the General Pharmaceutical Council (GPhC) can also prescribe Differin following a structured online consultation.

The standard NHS prescription charge in England is currently 9.90 pounds per item; prescriptions are free in Scotland, Wales, and Northern Ireland.

Private prescriptions are available but will cost more than the NHS charge.

Practical tips for managing acne alongside Differin

Keep your skincare routine simple. Use a gentle, non-foaming cleanser morning and evening. Apply a lightweight non-comedogenic moisturiser daily to manage dryness.

Do not pick, squeeze, or scratch spots, as this increases the risk of scarring and post-inflammatory hyperpigmentation. Change pillowcases regularly.

If you wear makeup, choose non-comedogenic, oil-free products and remove them thoroughly before applying Differin in the evening.

Acne is a chronic condition that may require long-term maintenance therapy.

Even after acne has cleared, your prescriber may recommend continuing adapalene at a reduced frequency (for example, two to three times per week) to prevent relapse.

Stopping treatment abruptly often leads to recurrence within a few months.

When to seek further medical advice

See your GP if your acne does not improve after 12 weeks of consistent treatment, if it worsens significantly, or if acne is causing scarring.

Seek dermatology referral if you have severe, widespread, or nodulo-cystic acne, or if first and second-line treatments have failed.

If acne is affecting your mental health or self-esteem, speak to your GP; psychological support and prompt escalation of treatment are both available through the NHS.

Sources

• Differin 0.1% Gel, Summary of Product Characteristics (EMC)
• Adapalene, British National Formulary (BNF)
• NICE CKS: Acne vulgaris
• Acne, NHS
• British Association of Dermatologists, Acne
• MHRA Yellow Card Scheme