 [ Symptoms ] my husband wants to know if its ok to take zyrtec and his sleeping pill which contains diphenhydramine 50mg  he uses an equate sleeping pill from wal wart and the active ingredient is diphenhydramine 50mg same as taking 2 benadryl is we are confused by that [ Disease ] yes shingles can be internal and can affect organs the answer above is so completely wrong as i have found another of his answers above wrong i have had internal shingles in my throat