Treat swollen lips due to an allergy with antibiotics, nonsteroidal anti-inflammatory drugs, antihistamines, corticosteroids and adrenaline injections, suggests WebMD. Home remedies to reduce swollen lips include applying aloe vera or a cold or hot compress to the lips several times during the day to reduce inflammation.
Antihistamines, adrenaline injections and corticosteroids work to eliminate the allergy that has caused the lips to swell and should be administered in consultation with a medical professional, explains WebMD. Swollen lips resulting from an allergy result from contact with an allergen, such as a makeup product, certain foods or pet dander. Allergic reactions that trigger swollen lips also include exposure to latex or pollens, a wasp or bee sting, and a reaction to certain medications. Lips swell when the immune system reacts to the allergen and attempts to protect itself.
Anaphylaxis is the most severe allergic reaction that can cause lips to swell, according to WebMD. Immediate medical attention is necessary, as this condition can be life-threatening. Symptoms of anaphylaxis include lip swelling accompanied by itchy eyes or face, breathing or swallowing difficulties, swelling in the throat or mouth, or hives. Severe symptoms of an allergic reaction that requires immediate medical attention include a drop in blood pressure, shock, an increased heart rate, weakness and unconsciousness.