Benadryl, an over-the-counter antihistamine, is commonly used for various purposes. It helps alleviate symptoms associated with allergies, such as sneezing, runny nose, itchy eyes, and itchy throat. Benadryl can also be used to address certain cold symptoms and, due to its sedative properties, as an occasional sleep aid for adults. Understanding the correct dosage ensures effectiveness and minimizes potential risks. This medication works by blocking histamine, a natural chemical in the body that triggers allergic reactions.
Understanding Benadryl Dosages
For adults 12 years and older, the typical oral dosage of Benadryl is 25 to 50 milligrams (mg). This dose can be taken every 4 to 6 hours as needed for allergy symptoms, cold symptoms, or to aid sleep. Do not exceed 6 doses in a 24-hour period, with a maximum daily intake of 300 mg for adults. Benadryl is available in various forms, including tablets, capsules, and liquid formulations; 25 mg tablets are a common strength.
Children’s dosages differ from adult dosages and are based on age or weight. For children aged 6 to 11 years, the recommended oral dose is 12.5 mg to 25 mg every 4 to 6 hours. The maximum daily dose for this age group should not exceed 150 mg in a 24-hour period. For children under 6 years old, consult a healthcare provider before administering Benadryl.
Liquid formulations, such as Children’s Benadryl Allergy Liquid, contain 12.5 mg of diphenhydramine per 5 mL. When administering liquid medication to children, use the dosing cup or syringe provided with the product to ensure accurate measurement. Standard kitchen spoons are not precise enough for medication dosing. Chewable tablets for children also contain 12.5 mg of diphenhydramine.
Older adults should consult a healthcare provider before taking Benadryl. Their bodies may process the medication more slowly, increasing the likelihood of side effects such as dizziness and urinary retention. Healthcare providers may recommend a lower dose or an alternative medication for older individuals to minimize potential adverse effects.
Key Safety Information
Benadryl can cause side effects, with drowsiness being common. Other side effects include dizziness, dry mouth, blurred vision, constipation, and upset stomach. Some individuals, especially children, may experience excitability or hyperactivity instead of drowsiness. Understand how the medication affects you before engaging in activities that require alertness, such as driving or operating machinery.
Certain medical conditions and medications can interact with Benadryl. Individuals with conditions such as glaucoma, an enlarged prostate, asthma, or chronic bronchitis should consult a doctor before using Benadryl. The medication can worsen these conditions or cause complications. Benadryl should be used with caution or avoided if taking sedatives, tranquilizers, or other medications that cause drowsiness, as this can intensify sedative effects.
Combining Benadryl with alcohol is not recommended, as alcohol can increase drowsiness and other side effects. Taking multiple antihistamines, even different brands or forms, should be avoided as it can lead to an excessive amount of diphenhydramine and increased side effects. Some over-the-counter cold and flu remedies may contain diphenhydramine, so check labels for the active ingredient to prevent accidental overuse.
Taking more than the recommended dose of Benadryl can lead to an overdose, which can be serious. Symptoms of an overdose may include severe drowsiness, confusion, hallucinations, dilated pupils, rapid heartbeat, seizures, and difficulty urinating. In severe cases, an overdose can result in coma or even death. If an overdose is suspected, or if someone experiences severe symptoms like seizures, difficulty breathing, or cannot be awakened, immediate medical attention is needed. Contacting a poison control center at 1-800-222-1222 in the United States provides guidance.