Prevymis and ToweRx Effervescent Potassium

• Generic Name: letermovir
• Dosage Forms: tablet, film coated
• Other Brand Names: Prevymis

Prevymis (letermovir) is an antiviral medicine used to help prevent cytomegalovirus (CMV) infection after a stem cell (bone marrow) transplant from a donor.

Prevymis is for use in adults who are seropositive for CMV. Seropositive means that the virus is in your blood even if you do not show any symptoms of infection.

A CMV-seropositive person is at risk for "reactivation" of the virus if the immune system becomes weak. While normally treatable, CMV infection can be serious in people undergoing a stem cell transplant.

Prevymis comes as a tablet or can be given by your doctor through an IV line (intravenously).

• Generic Name: potassium bicarbonate
• Dosage Forms: tablet, effervescent
• Other Brand Names: Effervescent Potassium, K-Effervescent, K-vescent, K-vescent, K+Care ET, Klor-Con/EF, Effer-K, Quick-K

Potassium is a mineral that is found naturally in foods and is necessary for many normal functions of your body, especially the beating of your heart.

Effervescent Potassium is used to prevent or to treat a potassium deficiency (hypokalemia).

Effervescent Potassium may also be used for other purposes not listed in this medication guide.