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It may be time to talk to your doctor. PREMARIN is a prescription medicine used to treat moderate to severe hot flashes due to menopause. Learn about PREMARINÂ® (conjugated estrogens tablets, USP) for the treatment of moderate to severe hot flashes due to menopause. You, your menopause, and your hot flashes. Keeping track of your hot flashes may be helpful.
The term PRN is a shortened form of the Latin phrase pro re nata, which translates roughly as as the thing is needed.PRN, therefore, means a medication that should be taken only as needed. Pain medicines, sleeping pills, and cough medicines are common examples of PRN medicines.ost blood pressure medications are taken as a preventive method or for controlling the rise of blood pressure. In light of this, a pro re nata (PRN) order from your doctor or â¦ cardiologist is unlikely. However, if the medication is for controlling acute systems of blood pressure, it is usually used pro re nata.