Side effects from Arimidex vary, but can start right after your first dose. Some may occur sooner than others. For example, you can experience headaches, nausea, or vomiting after only one dose of Arimidex.
Other side effects of Arimidex may take longer to happen. For example, side effects such as osteoporosis (weakened bones) or liver problems may not occur for months or years after taking the drug. Your doctor will monitor you for these side effects.
It’s possible to have any of the side effects from Arimidex even after taking the drug for a long time, such as 5 years.
If you have questions about specific side effects or side effects that may occur after taking Arimidex for years, talk with your doctor.