The main side effects of Toppik are itching, skin irritation, and changes in hair color and texture, says Drugs.com. Unwanted hair growth may occur if the medication gets into the circulation system or on skin areas other than the scalp.
Users can avoid these side effects by applying Toppik only to a healthy scalp while wearing gloves. Although severe allergic reactions are rare, those allergic to Toppik may experience rashes, hives, swelling of the face and tongue, difficulty breathing and swallowing, and rapid heartbeat, explains WedMD. Unexplained weight gain, swelling of the hands and feet, and chest pain are also possible side effects, and as with allergic reaction symptoms, should be reported to a physician immediately, notes DailyMed.