For adults and children over 12 years of age, the maximum is 300 mg each day. These newer medications include:Benadryl isn’t meant to be used for treating anxiety. This is not a complete list of side effects and others may occur. But after the person took Benadryl for four days, this side effect no longer occurred. Examples of these supplements include:As with all medications, the costs of Benadryl products can vary. However, this effect will wear off after a few days of using the product.If you have symptoms of anxiety, talk with your doctor about medications that are a better choice for treating your symptoms.Some topical, over-the-counter Benadryl products are approved for treating pain and itchy skin caused by poison ivy. Zyrtec usually costs more than Benadryl.Both of these products have store-brand versions. Bottom Line. The report points out that there are basically two major kinds of allergic reactions most people take Benadryl for… Anaphylaxis: This is the most serious form – the kind that can KILL. For children ages 6 to 12 years, the maximum is 150 mg each day.For adults or children, Benadryl products such as the cream, gel, and spray shouldn’t be applied to the skin more than 4 times per day.Your body can develop a tolerance to some of the effects of Benadryl. Talk to your doctor about your risk.Take Glucovance exactly as prescribed by your doctor. Benadryl products that are topical (applied to the skin) are approved for decreasing pain and itchy skin due to hives, insect bites, and other causes.Allegra is approved for decreasing symptoms of hay fever and other respiratory allergies, and itchy skin caused by hives, insect bites, and other causes.Benadryl is available in many different forms, including:Oral Benadryl products are usually taken every 4 to 6 hours. "Large doses of Benadryl can cause seizures and, particularly, problems with the heart," he added. * Both Benadryl and Zyrtec can cause sleepiness, but it’s more common in people who take Benadryl.Benadryl and Zyrtec are both effective for reducing symptoms of hay fever and other allergies, and for treating hives or itchy skin. If they’re more severe or don’t go away, talk to your doctor or pharmacist.Call your doctor right away if you have serious side effects. This side effect may go away after three to four days of daily use.Benadryl isn’t an effective treatment for anxiety. This means your body’s response to the drug may decrease over time.For instance, one study found that Benadryl caused sleepiness on the first day it was taken. Allegra usually costs more than Benadryl.Both of these products have store-brand versions. Store brands are usually cheaper than the brand-name versions.Benadryl is a first-generation antihistamine. Call your doctor for medical advice about side effects. They’re effective for this use, but they’re not usually a first-choice treatment because of side effects such as sleepiness.Newer, “second-generation” antihistamines are usually preferred over oral Benadryl for treating these symptoms. Your doctor may occasionally change your dose. No Benadryl or diphenhydramine product is available as a topical lotion or as eye drops.Benadryl is an over-the-counter antihistamine that’s used to help relieve symptoms of hay fever, other allergies, and the common cold, as well as itchy skin caused by insect bites, hives, and other causes.Some of Benadryl’s common uses are described below. There are several other antihistamines that can be used as alternatives.Antihistamines are typically classified as either first generation or second generation.The first-generation antihistamines usually cause more sleepiness and other side effects than the second-generation antihistamines. They may recommend other treatment options.Zyrtec (cetirizine) is an antihistamine. Oral Benadryl products aren’t approved for sleeplessness, but some people take oral Benadryl once before bedtime for that purpose.There are also several forms of Unisom products. We comply with the HONcode standard for trustworthy health information - Because anticholinergic drugs and Benadryl work in the same way, taking them together can increase the risk of side effects.