An oral dose of Benadryl reaches peak blood concentrations 2 to 3 hours after consumption, and the effects usually last for 4 to 6 hours, reports the National Highway Traffic Safety Administration. WebMD suggests taking an oral dose of Bendryal about 30 minutes before bedtime, if the drug is being used as a sleep aid, or right before traveling overseas, if the drug is being used for motion-sickness.Continue Reading
Bendryl is a brand name for the antihistamine drug diphenhydramine. The National Highway Traffic Safety Administration reports that blood concentrations of 25 nanograms per milliliter are effective for antihistamine uses; however, drowsiness occurs at 30 to 40 nanograms per milliliter, and cognitive impairment occurs at 60 nanograms per milliliter.
An adult taking an oral dose of 50 micrograms of Bendryl typically achieves a blood concentration of 80 nanograms per milliliter within 3 hours of consumption: That is more than sufficient to cause cognitive impairment. At 24 hours after consumption, the blood level drops to under 10 nanograms per milliliter.
WebMD reports that Bendryl can be used to treat allergies and motion sickness. Due to its sedating effect, it can be used as a sleep aid for most people. Some individuals, particularly children, report experiencing excitement and restlessness instead of drowsiness in response to Bendryl. WebMD warns that individuals experiencing signs of a severe allergic reaction should seek immediate medical help.Learn more about Medications & Vitamins
Benadryl is the brand name for diphenhydramine, an antihistamine used to alleviate symptoms of sneezing, runny nose, cough and watery eyes that accompany the common cold, allergies and hay fever. It is combined with pain-relieving drugs in popular over-the-counter sleep aids, according to WebMD.Full Answer >
A side effect of Benadryl is that it causes drowsiness, which can make people fall asleep. Numerous over-the-counter sleep aids contain antihistamines such as diphenhydramine and doxylamine succinate because of their potent sedative effects.Full Answer >
When deciding where to set up checkpoints, police must choose locations where there have been many wrecks or fatalities related to impaired driving, explains the National Highway Traffic Safety Administration. They must also consider the safety of the general public, volunteers and officers when making location decisions.Full Answer >
As of 2015, the National Highway Traffic Safety Administration of the U.S. Department of Transportation provides information on recall campaigns from 1966 to present at Recall.gov and SaferCar.gov, while the U.S. Environmental Protection Agency publishes information on its website related to vehicles that failed to comply with federal emissions requirements. Websites such as Edmunds.com, AutoBlog.com and AutoNews.com also frequently feature articles and other information about recent vehicle recalls.Full Answer >