What it is used for
- Allergic eye symptoms — itchy, red, watery eyes (eye drops)
- Hay fever and allergic rhinitis (nasal spray)
- Preventing asthma symptoms (inhaler, less commonly used now)
- Preventing allergy symptoms before exposure to triggers
How it works
Sodium cromoglicate stabilises mast cells, the cells that release histamine and other chemicals during an allergic reaction. By preventing this release, it stops allergy symptoms before they start, so it works best used regularly.
How it is taken
Available as eye drops, a nasal spray, and an inhaler, plus oral capsules for certain conditions. It is used regularly for prevention rather than for instant relief, and may need several days to take full effect. Use it exactly as your doctor, pharmacist, or the label directs.
No doses here on purpose. The right strength and schedule depend on you — only a doctor or pharmacist should set them. Always follow your prescription and the label.
Common side effects
- Temporary stinging or burning in the eyes (drops)
- Nasal irritation or sneezing (spray)
- Throat irritation or cough (inhaler)
- Unpleasant taste
Serious effects — get help
- Signs of a severe allergic reaction (swelling, breathing difficulty)
- Wheeze or breathing difficulty after using the inhaler
- Severe eye pain or vision changes
If a reaction is severe — for example trouble breathing, swelling of the face or throat, or collapse — go to the nearest emergency room now or call your local emergency number. Do not wait for an online consultation.
Interactions to watch
- Generally few significant interactions, but tell your clinician about all your medicines
- Other eye drops (separate them by a few minutes if using more than one)
Who should take care
- Tell your clinician if you are pregnant, planning pregnancy, or breastfeeding
- Use it regularly for it to work — it prevents rather than relieves symptoms
- Remove soft contact lenses before using the eye drops unless advised otherwise
- Allow a few days of regular use before judging whether it helps