EXCLUSIVE: Between 1991 and 2020, just 188 cases of adverse side effects were flagged to the MHRA, suggesting a shocking level of under-reporting of Botox treatments across Britain.EXCLUSIVE: Between 1991 and 2020, just 188 cases of adverse side effects were flagged to the MHRA, suggesting a shocking level of under-reporting of Botox treatments across Britain.Read MoreHealth News | Mail Online