Can someone be allergic to quinine and what are symptoms?

Yes, someone can be allergic to quinine, which is commonly found in tonic water and used to treat malaria. Symptoms of a quinine allergy may include skin reactions like hives or rash, respiratory issues such as wheezing or difficulty breathing, and gastrointestinal problems like nausea or vomiting. In severe cases, it could lead to anaphylaxis, a life-threatening reaction requiring immediate medical attention. If someone suspects an allergy, they should consult a healthcare professional.