Medical and Healthcare products Regulatory Agency (MHRA) 17/1/21:Ref. Roles and Responsibilities-Reporting of Adverse Side Effects and/or Allergic Reaction to Medication
“The scheme is not compulsory: it is voluntary for both healthcare professionals and members of the public….Although the MHRA does not regulate the education of healthcare professionals….the reporting of suspected adverse drug reactions is considered a healthcare professional’s duty and is strongly recommended by their various regulators and their respective professional guidance”.
JRCPT: Learning about drug Side Effects and adverse reactions
GMC Good Practice: “You must inform the MHRA about a) serious suspected reactions to products marked with a Black Triangle in the BNF and elsewhere USING THE YELLOW CARD SCHEME” and : You should provide patients with information about how they can report suspected side effects directly to the MHRA “.
Doctors surgery comment: Due to the high level of interactions patients can experience we would only report those reactions that were either unusual for a  well-known drug (had not already been well known about) OR for a drug that is relatively new to the market where it is still under what we call a black triangle(still being monitored).
Conclusion: Discrepancy in reporting. The guidance is not being followed therefore incidences of adverse reactions/side effects is being under reported