It is very important that your doctor check the progress of you or your child at regular visits to make sure this medicine is working properly. Blood tests may be needed to check for unwanted effects.
Using this medicine while you are pregnant can harm your unborn baby. The medicine may also cause birth defects if the father is using it when his sexual partner becomes pregnant. If a pregnancy occurs while you are using this medicine, tell your doctor right away.
It is important to tell your doctor if you or your female sexual partner become pregnant. Your doctor may want you to join a pregnancy registry for patients taking this medicine.
A negative pregnancy test is needed in women who are of childbearing age before starting treatment with this medicine. Two forms of birth control must be used together during treatment and for 6 months after treatment ends. You will need to have pregnancy tests done regularly to make sure you are not pregnant while being treated with this medicine and after your treatment ends.
Do not use Copegus® in combination with didanosine (Videx®, Videx® EC). Using these medicines together may cause serious medical problems.
Ribavirin may cause some people to be agitated, irritable, or display other abnormal behaviors. It may also cause some people to have suicidal thoughts and tendencies or to become more depressed. If you, your child, or your caregiver notice any of these side effects, tell your doctor or your child's doctor right away.
Check with your doctor right away if you or your child have back, leg, or stomach pains; bleeding gums; chills; dark urine; difficulty breathing; fever; general body swelling; headache; loss of appetite; nausea or vomiting; nosebleeds; pale skin; sore throat; unusual tiredness or weakness; or yellowing of the eyes or skin. These could be symptoms of a blood disorder called anemia.
This medicine may cause serious types of allergic reactions, including anaphylaxis. Anaphylaxis can be life-threatening and requires immediate medical attention. Stop taking this medicine and call your doctor right away if you or your child have itching, hives, hoarseness, trouble with breathing, trouble with swallowing, or any swelling of the hands, face, or mouth while you are using this medicine.
Serious skin reactions can occur with this medicine. Check with your doctor right away if you or your child have blistering, peeling, or loosening of the skin; fever or chills; hives or welts; red skin lesions; a severe skin rash or acne; or sores or ulcers on the skin while you are using this medicine.
Pancreatitis may occur while you are using this medicine. Stop using this medicine and check with your doctor right away if you or your child have sudden and severe stomach pain, chills, constipation, nausea, vomiting, fever, or lightheadedness.
You or your teenager should not drink alcoholic beverages (including beer, wine, or liquor) while you are taking this medicine.
This medicine may cause some people to become dizzy, drowsy, or less alert than they are normally. Make sure you know how you react to this medicine before you or your teenager drive, operate machinery, or do anything else that could be dangerous if you are not alert.
Check with your doctor if blurred vision, decreased vision, or any other change in vision occurs while you or your child are using this medicine. Your doctor may want you to have your eyes checked by an ophthalmologist (eye doctor).
Peginterferon injection combined with ribavirin can temporarily lower the number of white blood cells in your blood, increasing the chance of getting an infection. It can also lower the number of platelets in the blood, which are necessary for proper blood clotting. If this occurs, there are certain precautions you or your child can take, especially when your blood count is low, to reduce the risk of infection or bleeding:
- If you can, avoid people with infections. Check with your doctor immediately if you think you are getting an infection or if you get a fever or chills, cough or hoarseness, lower back or side pain, or painful or difficult urination.
- Check with your doctor immediately if you notice any unusual bleeding or bruising; black, tarry stools; blood in the urine or stools; or pinpoint red spots on your skin.
- Be careful when using a regular toothbrush, dental floss, or toothpick. Your medical doctor, dentist, or nurse may recommend other ways to clean your teeth and gums. Check with your medical doctor before having any dental work done.
- Do not touch your eyes or the inside of your nose unless you have just washed your hands and have not touched anything else in the meantime.
- Be careful not to cut yourself when you are using sharp objects such as a safety razor or fingernail or toenail cutters.
- Avoid contact sports or other situations where bruising or injury could occur.
This medicine may cause teeth and gum problems. This medicine may cause dryness of the mouth, and a dry mouth may damage your teeth and gums if you take the medicine for a long time. To help prevent this condition, carefully brush your teeth at least two times a day and have regular visits with your dentist. For temporary relief of mouth dryness, use sugarless candy or gum, melt bits of ice in your mouth, or use a saliva substitute.
Some patients who have used this medicine have had vomiting. If you vomit during your treatment, rinse your mouth out with water. This may also help prevent damage to your teeth and gums.
Ribavirin used together with injectable peginterferon alfa-2a or peginterferon alfa-2b may affect your child's growth. Your doctor may need to check your child's height and weight during and after treatment with these medicines.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.