For more information, ask your doctor or pharmacist and see the Peginterferon alfa-2a Medication Guide. Other buy ribavirin online goedkope possible side effects that may occur during therapy with ribavirin and interferon are fatigue, weakness, nausea, anorexia, heartburn, insomnia, irritability, difficulty breathing, rash, itching, and alterations in taste perception. The ribavirin dose may be lowered if you re experiencing serious side effects, and ribavirin may be stopped if side effects continue after lowering the dose. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Dose Modifications If severe adverse reactions or laboratory abnormalities develop during combination Ribavirin peginterferon alfa-2a therapy, the dose should be modified or discontinued, if appropriate, until the adverse reactions abate.