I think my 17 year old son has strep throat (white pustules in the back of his throat). Here is my main concern: what is the SAFEST antibiotic to take and can we take a lower dose than normally prescribed. His throat is not red or inflamed. The pustules however are very evident in good lighting (I looked last night and couldn t see any but this afternoon they were very obvious. He has a 103 temp, headache, upset stomach. My concern is that when I take him to Urgent Care they will no doubt prescribe antibiotics. I think he has had penicillin and no adverse affects . . .