Carrots are rich in carotenes, which are substances related to vitamin A. They're found in the orange pigments and are good for you, but, if you eat lots and lots of carrots, you can develop a yellowish or orange cast to your skin. It's mostly noticeable on the soles of your feet and the palms of your hands.
Benadryl is another decongestant safe for use in cats, although it is usually not as effective as chlortrimeton in treating congestion. Benadryl is generally more beneficial with treating snake bites, reactions to vaccinations, itching, and insect bites.
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.