This medication may be harmful to an unborn baby, or may cause a miscarriage. Do not use interferon beta-1a if you are pregnant. Tell your doctor if you are pregnant or plan to become pregnant during treatment.
Before using interferon beta-1a, tell your doctor if you are allergic to any drugs, or if you have liver disease, a thyroid disorder, epilepsy or other seizure disorder, heart disease, chest pain (angina), congestive heart failure, a heart rhythm disorder, or a history of depression or suicidal behavior.
Some patients using interferon medications have become very depressed or had thoughts of suicide. Stop using interferon beta-1a if you have symptoms of depression (sadness, crying, loss of interest in things you once liked) or if you have any thoughts of hurting yourself.
Do not self-inject this medicine if you do not fully understand how to give the injection and properly dispose of used needles and syringes.
To be sure this medication is not causing harmful effects, your blood and liver function will need to be tested on a regular basis. Your thyroid function may also need to be tested. Do not miss any scheduled appointments.