How to dose Heviran in the treatment of shin zodle?

Good evening, My mother already for the 6th time in her life begins shingles-yes, I know that shingles usually have once in a lifetime, but after many medical consultations we know that it is unfortunately her charm and still unfound is the cause of this condition. Moving on to the substance, however, mom feels more and more severe itching and learned from experience, we know that in such a situation you need to apply Heviran as soon as possible. Just a question-in what dosage? Unfortunately, we lost the dosage card from the doctor, and now we will not get there and we will be very grateful for the hint - we want to remedy it as soon as possible. Thank you in advance for your help!