Why do doctors prescribe concor 2.5 for hypertension?

Bisoprolol/Concor: Is a highly selective beta blocker used for mild to moderate hypertension (& angina pectoris). It lowers BP and block blood renin levels (which can raise bp). The 2.5 mg strength in no way suggests it is a weak med; another BP med may require 100mg or more to get same effect. Usual dose is 5 mg, but that dose may cause your BP to be too low; so doc decreased to 2.5 mg.