My son takes them for crippling panic attacks and they have definitely helped him. He can take a regular daily dose or as and when needed, so he takes one each evening before bed and occasionally one if he feels an attack might be developing, during the day. If they make you at all drowsy, as your GP if you can try sticking to one at bedtime, once your anxiety throughout the day is more controlled. I take a different type for high BP, and find they also really help with random palpitations and dizzyness I was experiencing.