Low blood pressure, the medical term hypotension is generally defined as that which is below normal and relational to the separate with things usurped into account much as age and activity levels. galore conditions can cause low blood pressure, with the most common being illness, taking drugs with side effects that lower the blood pressure, although this is very uncommon and nearly the only drugs that can cause this are alpha blockers which may give you postural hypotension – this is were you may feel dizzy or even faint when standing up. If you suffer from this, see your doctor immediately! He may prescribe higher blood pressure pills to gradually raise your blood pressure.