First of all, clinical trials are typically longer and more thorough than you imagine, they span years. The fact that COVID vaccines were fast-tracked gives people wrong idea about it.
Secondly, even after the product hits the market the company is still responsible for tracking any possible adverse effects. They have a hotline where a patient or doctor can report it, and every single employee or contractor (including receptionists, cleaning staff, etc.) is taught to report such events through proper internal channels if they accidentaly learn about them.
Secondly, even after the product hits the market the company is still responsible for tracking any possible adverse effects. They have a hotline where a patient or doctor can report it, and every single employee or contractor (including receptionists, cleaning staff, etc.) is taught to report such events through proper internal channels if they accidentaly learn about them.