Sedating anti histamine
While antihistamines may help you to fall asleep, overall sleep quality is usually not very good, he said.
Antihistamines can cause drowsiness, which might help you fall asleep for a few nights — but routine use of antihistamines for insomnia isn't recommended.
But determining which one works best for you may take a little trial and error. Claritin is long-acting, with effects that last for 24 hours.
Zyrtec acts the fastest — usually within one hour — but is also the most likely to make you drowsy, so avoid driving, alcohol, and sedatives as you figure out how you react. That's because it's less likely to make you feel sleepy than other, so-called sedating antihistamines such as Piriton (chlorphenamine).
For that reason, you shouldn't take these medications if you also take muscle relaxers, sleeping pills, or other drugs that cause drowsiness.
Taking them at the same time that you take sedating drugs can make you extremely sleepy. For people who take an antihistamine such as Benadryl for a cold or allergies, drowsiness is often a welcome side effect.
It has long been known that the administration of antihistamines can cause weight gain.
The maximum sedative effect of the drug occurs between 1—3 hours.
Decongestants may keep you awake and are usually taken during the day.