An allergic reaction to Vidalista, a medication containing tadalafil used to treat erectile dysfunction, can range from mild to severe and should be treated seriously. Symptoms of a Vidalista allergy may include skin rashes, itching, hives, swelling of the face, lips, tongue, or throat (angioedema), difficulty breathing, and dizziness. In severe cases, a potentially life-threatening reaction called anaphylaxis may occur, which requires immediate medical attention. Allergies can result from hypersensitivity to tadalafil or inactive ingredients in the tablet. If any allergic symptoms appear after taking Vidalista, discontinue use immediately and seek emergency medical care to avoid complications such as airway obstruction or shock.