Medications That Make Your Skin Burn in the Sun: A Pharmacist's List

If you burned badly in twenty minutes on a day you would normally have been fine, and you started a new medication in the last few weeks, those two facts are probably related. Drug-induced photosensitivity is common, under-recognised, and almost never mentioned when a prescription is handed over. I spent years as a pharmacist watching people find this out the hard way.

Here is the list, and what to do about it.

Written by Dr. Liia Ramachandra, PharmD, PhD — pharmacist, formulator and founder of EpiLynx.

Two different reactions, which behave differently

Phototoxic reactions are the common kind. The drug absorbs UV energy and releases it into surrounding tissue, damaging cells directly. It looks like an exaggerated sunburn, appears within minutes to hours, is confined to sun-exposed skin, and happens to anyone given a high enough dose plus enough light. It is dose-dependent and predictable.

Photoallergic reactions are less common. UV light changes the drug into a molecule your immune system treats as foreign. It looks like eczema — itchy, bumpy, sometimes spreading beyond sun-exposed areas — appears 24 to 72 hours later, and only affects people who have become sensitised. It is not dose-dependent.

The practical difference: phototoxic reactions resolve when you stop the drug or cover up. Photoallergic reactions can recur on re-exposure to very little of the drug and often need dermatology input. Either way the protection is the same, and it should be a mineral filter — our SPF 50 Mineral Moisturizer scatters UV rather than absorbing it, which is exactly what you want when the problem is a molecule in your skin absorbing UV.

The medications most often responsible

Antibiotics

• Tetracyclines — doxycycline especially. One of the most common causes, and widely prescribed for acne and rosacea, meaning young people on long courses through summer.
• Fluoroquinolones — ciprofloxacin, levofloxacin.
• Sulfonamides — including trimethoprim-sulfamethoxazole.

Skin and acne treatments

• Isotretinoin and topical retinoids.
• Topical acids — AHAs and BHAs increase UV sensitivity for about a week after use.
• Benzoyl peroxide, mildly.

Cardiovascular

• Thiazide diuretics — hydrochlorothiazide is a notable one, and long-term use has been associated with increased skin cancer risk.
• Amiodarone — can cause a distinctive slate-grey discolouration.
• Some calcium channel blockers and ACE inhibitors.

Autoimmune and inflammatory treatments

• Methotrexate — can cause radiation and sunburn recall, where a previously burned area flares again.
• NSAIDs — particularly piroxicam and naproxen. Topical NSAID gels too.
• Hydroxychloroquine is generally protective in lupus rather than photosensitising, but it can cause pigmentation changes.

Others worth knowing

• Some antidepressants — tricyclics, and St John’s wort, which people take without telling anyone because it is over the counter.
• Antifungals — voriconazole notably.
• Diabetes medications — sulfonylureas.
• Chemotherapy agents — several, and worth asking your oncology team about specifically.

This list is not exhaustive, and it is not a reason to stop anything. It is a reason to protect yourself properly while you take it.

Not just drugs — plants and fragrance do this too

Phytophotodermatitis is the same phototoxic mechanism caused by furocoumarins in plants. Lime juice is the classic culprit — the streaky burn known as margarita dermatitis. Also celery, parsnip, fig, and giant hogweed. Bergamot and other citrus essential oils in fragrance do it too, which is a good reason not to apply scented products to skin that will see sun.

What to do while you are on a photosensitising drug

1. Mineral SPF 50, daily, without exception. Mineral filters do not rely on absorbing UV, which is exactly what you want when the problem is a molecule in your skin absorbing UV.
2. Reapply every two hours outdoors. Phototoxic reactions can be triggered by modest exposure.
3. Cover up. UPF clothing, hat, sunglasses. More reliable than any cream.
4. Remember windows. UVA passes through glass, and most drug photosensitivity is UVA-driven.
5. Avoid tanning beds entirely.
6. Ask your pharmacist when you collect a new prescription. We can check the whole list at once, including anything over the counter you are taking.
7. If you react, treat it as sunburn — cool compresses, bland emollient, no scrubbing — and contact your prescriber. Do not stop a prescribed medicine without advice.

What I actually reach for

• SPF 50 Mineral Moisturizer — the one to use while on any drug on this list.
• Tinted CC Moisturizer SPF 55 — for daily wear with coverage.
• Cooling Calming Nurturing Face Cream — after a reaction.
• Lightweight Face Moisturizer — fragrance-free, no citrus oils.

Fragrance-free matters here specifically — bergamot and citrus oils are themselves phototoxic. Shipping is free over $39, and EPILYNXGLOW25 takes 25% off.

Frequently asked questions

How soon after starting a medication can photosensitivity appear? Phototoxic reactions can happen within minutes to hours of sun exposure, often on the first sunny day. Photoallergic reactions appear 24 to 72 hours later.

Which antibiotic is the most common cause? Doxycycline. It is widely prescribed for acne and rosacea, often on long courses running through summer.

Should I stop my medication if I burn? No. Treat it as sunburn, protect yourself properly, and contact your prescriber. Never stop a prescribed medicine on your own.

Does sunscreen through a window matter? Yes. Standard glass blocks UVB but lets UVA through, and most drug photosensitivity is UVA-driven. Car side windows are the worst offender.

Can food cause this too? Yes — furocoumarins in lime, celery, parsnip and fig cause the same phototoxic reaction on skin, as do bergamot and citrus oils in fragrance.

Keep reading

• Sunscreen for Allergic and Sensitive Skin
• The Best SPF for Sensitive, Allergy-Prone Skin
• Skincare for Autoimmune Conditions
• Sun Protection Tips

Educational information from a pharmacist, not medical advice. Never stop or change a prescribed medication without speaking to your prescriber.