How common is facial swelling in drug allergy?

A drug allergy can cause swelling of the lips, eyelids, face, tongue, or throat. It may occur with hives, itching, rash, wheezing, vomiting, dizziness, or fever, depending on the reaction. The timing in relation to each medicine matters, including prescriptions, over-the-counter products, supplements, and medicines taken only occasionally. A clinician must distinguish allergy from side effects and from unrelated causes of swelling.

Seek medical advice promptly for new facial swelling after starting or taking a medicine. Keep the medicine packet and record its name, dose, when you took it, and when symptoms began. Do not take another dose of a medicine suspected of causing an allergic reaction until a clinician has advised you. Tell every healthcare professional about a suspected reaction so it can be assessed and documented carefully.

Call emergency services immediately for trouble breathing, noisy breathing, throat tightness, tongue swelling, difficulty swallowing, a hoarse voice, collapse, or rapidly worsening symptoms. If you have a personal emergency plan and prescribed adrenaline auto-injector, follow that plan while emergency help is arranged. Do not drive yourself if you feel faint or unwell.

Ask which medicine is the suspected trigger, whether alternatives are appropriate, and whether referral for allergy assessment is needed. Ask how the reaction should be recorded and what symptoms would require emergency treatment in the future.