39 Check with your doctor immediately if any of the following side effects occur during treatment with Ribavirin Teva in combination with an alpha interferon product: chest pain or persistent cough; changes in the way your heart beats; confusion, feeling depressed; suicidal thoughts or aggressive behaviour, attempt suicide, feelings of numbness or tingling, trouble sleeping, thinking or concentrating; severe stomach pain; black or tar-like stools; blood in stool or urine; severe bleeding from your nose; fever or chills beginning after a few weeks of treatment; lower back or side pain; painful or difficult urination; problems with your eyesight or hearing, severe skin rash or redness.