Medical Oncologist
Alectinib side effects
Severe Sun Sensitivity on Alectinib: — Preventing Serious Burns
Alectinib makes your skin burn far more severely than normal sun exposure would — even a few unprotected minutes outdoors can cause a serious reaction. Most of this is preventable, and the steps that protect you are straightforward.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed August 2026
- It is real and common — Photosensitivity is one of the most frequently reported side effects of alectinib.
- Brief exposure is enough — A short walk to the car or sitting near a window can trigger a reaction.
- Most cases are preventable — Consistent daily sun protection stops most reactions before they start.
- Blistering is the line — Any blistering or broken skin means calling your team the same day.
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Alectinib makes your skin burn much faster and more severely than normal sun would. This is a known and common effect of the drug. Most reactions can be managed at home with careful sun protection, but blistering, widespread redness, or skin that breaks open needs same-day contact with your team.
Is alectinib sun sensitivity dangerous?
For most people, reactions stay mild — a redness that fades within a day or two with rest and careful protection going forward. Uncomfortable, but not an emergency.
The risk is in underestimating it. Alectinib-related photosensitivity can turn a few unprotected minutes in sun into a reaction that looks and feels like a severe burn, and severe burns on skin already stressed by treatment can become infected.
The other risk is stopping alectinib without telling your team. The drug is keeping the cancer under control. If your skin is badly affected, call your team — they can advise on whether a dose adjustment is needed and treat the skin reaction at the same time. Do not make that decision alone.
What can you do at home for a mild reaction?
A mild reaction — redness, warmth, some tenderness over a small area — can be managed at home by getting out of the sun immediately and keeping the skin cool and moisturised.
Do not apply ice directly to the skin. A cool, damp cloth and a gentle unperfumed moisturiser help. Keep the affected area out of any further sun while it heals.
Do not use over-the-counter products marketed for sunburn without checking with your pharmacist first, and mention that you are on alectinib. If redness has not improved after a day or two, or gets worse rather than better, call your team.
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How serious is your skin reaction?
| Feature | Mild — manage at home | Moderate — call today | Severe — go to hospital |
|---|---|---|---|
| Appearance | Redness, warmth, tenderness over a small patch | Widespread redness, marked swelling | Blistering, broken or weeping skin |
| Pain level | Uncomfortable but manageable | Painful, affecting daily tasks | Severe, affecting sleep or movement |
| Area affected | Small — face, arms, or a limited patch of exposed skin | Large area or spreading across the body | Extensive, or spreading beyond sun-exposed skin |
| Fever | None | None or low-grade | Any fever alongside skin changes — go now |
| Typically starts | Within the first few weeks of starting alectinib, but can occur at any point during treatment | Same window — escalation from an unmanaged mild reaction | Same window — escalation from moderate |
Daily sun protection on alectinib
- Apply broad-spectrum SPF 50+ sunscreen to all exposed skin every morning, even on cloudy days.
- Reapply sunscreen every two hours when outdoors, and after swimming or sweating.
- Wear long sleeves, trousers and a wide-brimmed hat — UPF-rated sun-protective clothing adds cover that sunscreen alone does not.
- Stay indoors or in full shade during the middle of the day, roughly 10am to 4pm.
- Sit away from windows — glass filters some UV but not all, and alectinib increases sensitivity to what gets through.
- Tell your pharmacist you are on alectinib before buying any new skincare or topical product, including traditional or herbal preparations.
Did you know?
Photosensitivity is among the most commonly reported side effects in clinical trials of alectinib — and unlike many drug reactions, it is largely preventable.
The sun protection steps are not optional extras while you are on this drug. They are part of the treatment.
Source: Alecensa (alectinib) Summary of Product Characteristics; ESMO guidelines on ALK-positive NSCLC management
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Common questions
Frequently asked questions
Can I go outdoors at all while on alectinib?
Yes, you can go outdoors. The aim is not to stay inside completely but to go out with protection in place. Broad-spectrum SPF 50+ sunscreen on all exposed skin, long sleeves, a wide-brimmed hat, and avoiding the middle of the day are the steps that make outdoor time manageable. Many people on alectinib handle this well once it becomes part of their daily routine. The problem is unprotected exposure — even a short walk without sunscreen can be enough to cause a reaction.
Does the sun sensitivity get better over time?
It does not reliably improve the longer you are on alectinib. Some people find it easier to manage once protection is built into their daily routine, but the underlying sensitivity tends to persist for as long as you are taking the drug. Do not assume that because nothing has happened so far, it will not. If reactions are affecting your quality of life, that is a conversation to have with your oncologist — a dose adjustment is sometimes possible — but is not a reason to stop treatment on your own.
Is sunscreen alone enough protection?
Sunscreen is the most important step, but it works best when combined with protective clothing and shade. A broad-spectrum SPF 50+ sunscreen covers most of the UV spectrum that causes reactions. Reapplying every two hours outdoors matters as much as the SPF number, because sunscreen wears off. For days with longer outdoor exposure — a family event, a journey — UPF-rated sun-protective clothing adds a layer of protection that sunscreen alone cannot provide.
Will a skin reaction mean my alectinib dose gets reduced?
A mild reaction rarely affects the dose. A severe reaction — blistering, broken skin, or a large affected area — may lead your oncologist to pause the drug briefly or reduce the dose while the skin heals, then restart once it has settled. The decision depends on how severe the reaction is and how well the cancer is responding. Reporting early is what keeps the milder options available. Waiting until a reaction is serious limits what your team can do.
Are there skincare products I should avoid on alectinib?
Avoid perfumed products on sun-exposed skin, as fragrance can increase irritation. Some topical treatments — retinoids, alpha-hydroxy acids, and benzoyl peroxide — increase photosensitivity on their own and are best avoided unless your oncology or dermatology team has said they are safe for you. If you use traditional or herbal preparations on your skin, tell your treating team — some plant-based ingredients also increase sun sensitivity and may interact with how the drug behaves.