Yes, My Husband Was Given Peridin-c For Hot Flashes Related

yes, My husband was given peridin-c for hot flashes related to hot flashes he gets from hormone therapy for Lupron shots he receives to treat prostate cancer. He started taking the medicine on this past Saturday, while at work today he experienced dizziness, with a problem with equilibrium ( running into walls etc..), he is taking one tablet 3 times a day, do you have any suggestions?