Sleep Soundly Without Unwanted Side Effects! Puralin is Safe to Use Even if Your Suffer From:. Breathing Problems. Glaucoma. Enlarged Prostate. No unfavorable interaction with other drugs! Puralin™ PM Does Not Contain Diphenhydramine HCl! . For the natural treatment of symptoms of insomnia from various causes frequent waking interrupted sleep and unrefreshing sleep. Contains no artificial sugar.