Is it safe to take 1/2 a pill of doxylamine succinate every night?

Doxylamine: Doxylamine succinate trouble of the active ingredient in Unisom, is a non-habit-forming antihistamine that promotes sleep. As long as you tolerate it well, it should not hurt you to take a half a tab of that each evening, but it would be better if you could figure out a way not to take it every night. Good luck.

Yes, generally safe: Doxylamine is a first generation anti-histamine. It taken commonly for night time allergies. If you have allergies that keep you up or disrupt your sleep this agent may help. If you taking it for insomnia, be aware that anti-histamines are good for initiating sleep, but do not produce continuous sleep. In other words your sleep can be light and easily disrupted.