please I need help with variables that follows a normal distribution in medicine such as blood pressure. if I consider blood pressure to have a

please I need help with variables that follows a normal distribution in medicine such as blood pressure. if I consider blood pressure to have a larger standard variation such as number of different patients with high blood pressure. Now if I take into consideration those who are on blood pressure medications to control and regulate their pressures? How would i incorporate this information into the normal distribution?