I am a high sweater Is taking betablockers 1hr b4 interview would make me look calm. Is this true? pls help.?

I am a person with hyperhidrosis (excessive sweating) I tend to sweat more than others. It is really a disadvantage in interviews coz I sweat profusely in interviews even in cold weather. Recently I attended an interview for a customer service position. I gave them a follow up call & they said I am not successful as I looked nervous. I tried relaxation therapies but it doesn’t help me to get through interviews. I heard that taking beta blockers 1hr before interview would make me look calm. Is this true? or is there any legal drug that would help me?