Detailed Diphenhydramine dosage information for adults and children. Includes dosages for Insomnia, Allergic Rhinitis, Allergic Reaction and more; plus renal, liver and dialysis adjustments. Benadryl is a brand) name for diphenhydramine hydrochloride, a sedating antihistamine used to treat allergies, sleep problems, and motion sickness. The recommended dosage of Benadryl by condition is as follows. Benadryl (diphenhydramine) is an over-the-counter (OTC) antihistamine used to treat allergy symptoms, such as sneezing and runny nose. It’s safe for most adults and children ages 6 and older to take at recommended dosages. The typical adult Benadryl dosage is 1 to 2 tablets or capsules by mouth every 4 to 6 hours as needed. Adults ages 65 and older should contact a healthcare professional. Find BENADRYL® dosage information for adults, children, and toddlers and learn how much you and your family should take with our allergy medicine product-dosing guide. Get the facts on Benadryl’s dosages. You can also learn how to take the drug, which forms it comes in, and more. Medscape - Hypersensitivity reactions, insomnia, antihistamine-specific dosing for Benadryl, Nytol (diphenhydramine), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation schedules, and cost information. Diphenhydramine (Benadryl) Dosage Table For treatment of allergic reactions, nasal allergies, and hives. AGE LIMITS: Do not use under 1 year of age unless directed by provider are more accurate than teaspoons. If possible, use the syringe or dropper that comes with the medicine. If no Home › Health › Benadryl Dosage Calculator Benadryl Dosage Calculator Calculate the appropriate diphenhydramine (Benadryl®) dose based on body weight, age, and formulation. This tool supports liquid, chewable, tablet, and capsule forms for both children and adults. Add 10 mL of 50 mg/mL diphenhydramine to 40 mL of NS Sedation is dose related and is similar to what would be expected for IM doses Relative contraindications are the same for IM diphenhydramine administration Pediatric Dosing Allergic reaction Oral/IM/IV: 5mg/kg/day divided q6-8h (1.25-1.67mg/kg/dose) Alternate PO dosing 2-6 yo: 6.25mg q4-6h Giving your child Benadryl? Find the recommended amount of Benadryl to give your child based on age and weight using the St. Louis Children's Hospital Benadryl dosage chart.