Before taking valganciclovir,
tell your doctor and pharmacist if you are allergic to valganciclovir, acyclovir (Zovirax), ganciclovir (Cytovene or Cytovene-IV), or any other medications.
do not take ganciclovir (Cytovene, Cytovene-IV) while you are taking valganciclovir.
tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking. Be sure to mention the medications listed in the IMPORTANT WARNING section and any of the following: aminoglycoside antibiotics such as amikacin (Amikin), gentamicin (Garamycin), neomycin (Neo-Rx, Neo-Fradin), netilmycin (Netromycin), streptomycin, tobramycin (Nebcin, Tobi), and others; amphotericin B (Fungizone); captopril (Capoten, in Capozide); diuretics ('water pills'); foscarnet (Foscavir); gold compounds such as auranofin (Ridaura) or aurothioglucose (Solganal); imipenem-cilastatin (Primaxin); immune globulin (gamma globulin, IGIV, BayGam, Carimmune, Gammagard, others): methicillin (Staphcillin); muromonab-CD3 (OKT3); mycophenolate mofetil (CellCept); nitrates such as isosorbide dinitrate (Isordil, Sorbitrate) or nitroglycerin products; penicillamine (Cuprimine, Depen); primaquine; probenecid; rifampin (Rifadin, Rimactane); or other nucleoside analogues such as acyclovir (Zovirax), famciclovir (Famvir), and ribavirin (Copegus, Rebetol, Virazole, in Rebetron). Your doctor may need to change the doses of your medications or monitor you carefully for side effects.
tell your doctor if you have or have ever had the conditions mentioned in the IMPORTANT WARNING section or any of the following conditions: seizures; an eye problem other than CMV retinitis; high blood pressure; higher than normal calcium in your blood; kidney, or liver disease; or if you are being treated with hemodialysis (a special machine that removes waste products from blood).
tell your doctor if you are breast-feeding. You should not breastfeed while taking valganciclovir. Talk to your doctor about when you may safely begin breastfeeding after you stop taking valganciclovir.
if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking valganciclovir.
you should know that valganciclovir may make you drowsy, dizzy, unsteady, confused, less alert, or cause seizures. Do not drive a car or operate machinery until you know how this medication affects you.