Hi, Propranolol is a good choice for controlling the autonomic symmptoms of anxiety like palpitations, sweating tremors, chills etc. The suggested dose should be enough but can be hiked if needed, up to 60 mg per day. But you need to keep in mind that propranolol can cause bronchospasm, bradycardia and low blood pressure. The other important thing is that propranolol will not prevent further attacks and will not reduce the psychological signs of anxiety, like the worries. If the episodes are frequent, then a SSRI (sertraline, paroxetine etc) would be a better choice as it will gradually reduce the frequency and intensity of episodes and control the anxiety. Hope this helps you. Best wishes.