Benadryl, known by its active ingredient diphenhydramine, is a widely available over-the-counter antihistamine. It is commonly used to provide temporary relief from various allergy symptoms, such as sneezing, a runny nose, itchy eyes, and watery eyes. This medication also helps alleviate cold symptoms and can sometimes be used as a short-term sleep aid. Benadryl works by blocking histamine, a natural substance in the body that triggers allergic reactions.
Dosing for Adults
For adults seeking relief from allergy or cold symptoms, the recommended dosage of Benadryl is 25 milligrams (mg) to 50 mg. This dose can be taken every four to six hours as needed. Do not exceed 300 mg within a 24-hour period. Always consult the product label for specific instructions, as formulations can vary. Different forms of Benadryl, such as tablets, capsules, or chewables, may have varying strengths, making label adherence important.
Dosing for Children
Dosing Benadryl for children requires careful attention to age and product formulation. Parents should always refer to the specific product label for children’s Benadryl, as these products are designed with different concentrations for pediatric use. For children aged 6 to 11 years, a typical dose ranges from 12.5 mg to 25 mg every four to six hours. The total amount given should not exceed 150 mg in a 24-hour period for this age group.
Use a proper measuring device, such as a dosing cup or oral syringe, when administering liquid formulations to ensure accuracy. Household spoons are not accurate and can lead to incorrect dosing. Benadryl is not recommended for children under two years old without a doctor’s guidance, and for children under six, medical advice should be sought due to potential side effects and overdose risks. Do not use Benadryl to make a child sleepy, as it can sometimes cause hyperactivity or agitation in younger children.
Important Usage Information
Benadryl can cause common side effects, including drowsiness, dizziness, dry mouth, blurred vision, and constipation. Due to potential drowsiness, avoid driving or operating heavy machinery after taking Benadryl until its effects are known. Alcohol and other sedatives can intensify these effects, leading to increased drowsiness and impaired coordination, and should be avoided when using Benadryl.
Individuals with certain medical conditions should exercise caution or avoid Benadryl altogether. These conditions include:
- Glaucoma
- An enlarged prostate
- Asthma
- Chronic obstructive pulmonary disease (COPD)
- Heart disease
- High blood pressure
- Thyroid disorders
Consult a healthcare professional before using Benadryl if you have underlying health issues or are taking other medications, to prevent potential interactions. If symptoms worsen, new symptoms appear, or signs of overdose such as extreme drowsiness, confusion, hallucinations, or a racing heart occur, immediate medical attention or contact with a poison control center is necessary.