The reporting of suspected adverse drug reactions (ADRs) to government regulators of the pharmaceutical industry by consumers (parents, guardians or caregivers) is key to identifying drug safety issues and improving prescription drug safety. It is estimated, for example, that only 1 to 10% of ADRs are reported to the Food and Drug Administration (FDA) in the United States. And almost all of those reports come from the pharmaceutical industry, which is mandated to report ADRs. 

Before you submit a government report, it might be helpful to get a free RxISK Report, which determines how likely it is that your adverse reaction was caused by a drug side effect. 

Here are the ADR reporting websites for a few countries: