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The first one is nebivolol
/ selective beta blocker
- - in the same class as Bisoprolol
Addition of HCTZ
controls pressure better
It may not help better - in the tachycardia! - that may need specific investigations to find out the cause and appropriate management.
It is not advisable to split the tablet- unless specifically instructed / some preparations will lose special characteristics like release, absorption and so on in the some formulations.
Wishing speedy recovery