Dosage
        Diphenhydramine's dosage details are as follows:
        
            
                | Dose | Single Dose | Frequency | Route | Instructions | 
            
                | Adult Dosage | 
            | 20 to 50 mg | 35 (35) | 3 hourly | PO,IV,IM |  | 
            
                | Paedriatic Dosage (20kg) | 
            | 1.25 to 2.5 mg/kg | 1.9 (1.875) | 8 hourly | Oral |  | 
            
                | Neonatal Dosage (3kg) | 
            | No data regarding the neonatal dosage details of Diphenhydramine is available. |