Benadryl dosage differs based on the weight of the patient, as well as their age, health condition, and some other factors. The dosing is also different for humans and pets (dogs, cats, horses, rabbits, etc). Different types of Benadryl contain different amounts of the active ingredient, plus the inactive ingredients. You need to be especially careful when administering Benadryl to small children and young pets.
Dogs and Other Pets
The general dosage of Benadryl for dogs and cats prescribed by veterinarians is 1 (one) milligram (mg) per 1 (one) pound every 8 (eight) hours. The dosage may be different for very small/young animals, as well as pregnant/nursing pets, animals with certain health conditions, and pets taking certain medicines.
Any type of Benadryl that you purchase has a dosage chart on the label. This is the first place to look. And here is the common dosage chart for children:
|Child’s weight||20-24 lbs.||25-37 lbs.||38-49 lbs.||50-99 lbs.||100 lbs.|
|Total amount (mg)||10 mg||12.5 mg||19 mg||25 mg||50 mg|
|Liquid 12.5mg/5 ml (tsp)||¾ tsp||1 tsp||1 ½ tsp||2 tsp||–|
|Chewable 12.5 mg||–||1 tablet||1 ½ tablets||2 tablets||4 tablets|
|Capsules 25 mg||–||–||–||1 cap||2 caps|
The dosages stated above can be administered every 6-8 hours (please ask your doctor first).
The chart above only takes into account the weight of the child. Other charts also take into account the child’s age and underlying condition. It is considered that Benadryl is unsafe for children under two. Some Benadryl packages advice not to give the medicine to children under six. However, there are infant drops of Benadryl that are considered safe for infants. It is important to consult with the doctor prior to starting to administer Benadryl to small children.
If you are using liquid Benadryl for small children, you can use a syringe for accuracy in measuring the pediatric dose.
The general Benadryl dosage for adults is 50 mg every 4-6 hours, depending on the symptoms. Pregnant women should consult with their health care professionals prior to starting to take Benadryl. The maximum allowable dosage for adults in a 24-hour period is 300mg.
Note: You shouldn’t take more of this antihistamine medicine than is recommended on the label without proper medical supervision. If that dosage didn’t work, taking more isn’t likely to help and may instead result in an overdose.
Note: Benadryl can make the patient drowsy and sleepy, or on the contrary – agitated.
The medicine should start to work within 1-2 hours of taking it. The effects of Benadryl typically last about 6 hours.