Viral hives often itch like crazy and can cover more than a small area of the body. You can have viral hives on your arm for a few minutes, only to see them move to your shoulder or even your stomach.
Highs from a range of sources (natural or induced) can be exciting and compelling. But, there are definitely both short-term and long-term effects of using diphenhydramine, the active ingredient in many antihistamines, (like Benadryl) that are worth noting. Diphenhydramine and other antihistamines affect your central nervous system, which is why the list of possible effects is so long and broad â people may react to the same stimulus in various different ways. Some possible short-term effects include: Light-headedness; Loss of coordination; Dry nose, throat, and mouth; Blurred vision
Benadryl for Kitty Nerves. Humans who have taken Benadryl know that one of its side effects is a sedative one. In fact, the active ingredient in Benadryl, diphenhydramine, is sometimes prescribed to both humans and cats for this effect. It also has an anti-nausea effect, which can be useful in preventing nervous cats from getting sick. Benadryl is often recommended for traveling cats for these reasons. It helps calm them and prevent motion sickness. The recommended dosage is 0.5 to 2 mg per pound of your cat's weight every 8 to 12 hours.