Allergic Reaction (Benadryl)
Dosages for Diphenhydramine (Benadryl) for different weights
| Medicine Name: Diphenhydramine (Benadryl) | May Give Every | 20/24 lbs. | 25-37 lbs. | 38-49 lbs. | 50-99 lbs. | 100+ lbs. |
|---|---|---|---|---|---|---|
| Liquid 12.5 mg/ 1 teaspoon (tsp) | 6-8 hours | 3/4 tsp. | 1 tsp. | 1-1/2 tsp. | 2 tsp. | - |
| Liquid 12.5 mg/ 5 milliliters (mL) | 6-8 hours | 4 mL | 5 mL | 7.5 mL | 10 mL | - |
| Chewable 12.5 mg | 6-8 hours | - | 1 tab. | 1-1/2 tab. | 2 tab. | 4 tab. |
| Tablets 25 mg | 6-8 hours | - | 1/2 tab. | 1/2 tab. | 1 tab. | 2 tab. |
| Capsules 25 mg | 6-8 hours | - | - | - | 1 cap. | 2 cap. |
When to Use. Treatment of allergic reactions, nasal allergies, hives and itching.
Table Notes:
- DOSE. Find the child's weight in the top row of the dose table. Look below the correct weight for the dose based on the product you have.
- MEASURE the DOSE. Syringes and droppers are more accurate than teaspoons. If possible, use the syringe or dropper that comes with the medicine. If not, you can get a med syringe at drug stores. If you use a teaspoon, it should be a measuring spoon. (Reason: regular spoons are not reliable.) Keep in mind 1 level teaspoon equals 5 mL and that ½ teaspoon equals 2.5 mL.
- ADULT DOSE. 50 mg
- HOW OFTEN. Repeat every 6 hours as needed.
- CHILDREN’S BENADRYL FASTMELTS. Each fastmelt tablet equals 12.5 mg. They are dosed the same as chewable tablets.
Customized from Itching Allergies v0.1 7/8/2025
