There are many antiviral drugs with different drug structures, which produce different side effects. Different antivirals treat different diseases, and some may require medication for life, so when using them, they must be combined with their own conditions under the guidance of a doctor to choose the right drug treatment, as follows:1. Commonly used anti-influenza viruses, such as amantadine and amantadine, may cause side effects when used, such as abdominal pain, dizziness, high blood pressure or hypotension, hypertension or postural hypotension.2. Neuraminidase inhibitors such as oseltamivir, taken orally, can cause fatigue, mental abnormalities, convulsions, flu symptoms, and laryngeal edema.3. Ribavirin can cause renal damage, and in severe cases, acute renal failure, uremia, bone marrow hematopoietic suppression, anemia, white blood cells, or reduced granulocyte counts.4. Anti-herpesvirals such as acyclovir and entecavir, etc. Common side effects include transient blood creatinine, urea nitrogen elevation, hematuria, proteinuria, bone marrow hematopoietic function inhibition, white blood cell count reduction, etc. Central nervous system symptoms, such as abnormal mental tension, can also occur.