How will switching from a cardiononselective beta blocker to a cardioselective beta blocker, effect me?

[Linden T]

I was recently switched from Corgard 20mg to Tenormin 20mg because the Corgard made my asthma worse. What can I expect for side effects during the transition? Anyone ever experience anything?
that should be tenormin 25mg not 20

[tinmuning]

Non-selective beta blockers are often contraindicated in patients with asthma and other pulmonary disorders since they affect all beta receptors (Beta 1 for the heart & Beta 2 for the lungs). So while your heart condition improves, your respiratory condition worsen since these drugs affect B2 as well, causing bronchospasm.

Cardioselective beta blockers can be used safely in patients with reactive airway disease since they act on the particular beta receptor responsible for the heart condition, leaving beta 2 receptor unaffected.

The most common Tenormin side effects are nausea & dizziness.

[Linden T]

Thank you for your detailed and very informative reply.