Yes, you can give your cat melatonin. Melatonin supplements are often given to cats to help with anxiety or stress-related issues that may cause difficulty sleeping.
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As in humans, Benadryl can also have a sedative effect in cats, but Eddy cautions that it can have the opposite effect as well: Instead of calming your cat, your cat could become even more fired up, he says. Finally, you could potentially use Benadryl to prevent motion sickness in your cat before riding in the car.