 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  lead to serious infections in the body, including an infection in the eye, called CMV retinitis, that can cause blindness.Ganciclovir is also used to treat people with weakened immune systems (including people with AIDS) who have CMV retinitis. Ganciclovir works by slowing the growth of the CMV virus. It helps control CMV retinitis and decrease the risk of blindness. It also helps prevent the spread of infection to other areas of the body.Ganciclovir is not a cure for CMV disease. Some people may have worsening CMV retinitis even with treatment. It is important to have your eyes checked regularly by your doctor. How to use Ganciclovir Plastic Bag, Injection This medication is given by injection into a vein usually over a 1-hour period. Do not give this medication any faster than prescribed because doing so will increase the risk of side effects. At the start of treatment, ganciclovir is usually given every 12 hours for the first few weeks, and then once a day either 5 or 7 times a week after that, or as directed by your doctor. Drink plenty of fluids while using this medication unless your doctor directs you otherwise. If you are </s>