Moderate
Bisoprolol × Morphine
Selective beta-adrenergic blockers×Natural opium alkaloids
Mechanism
Additive bradycardia and hypotension. Morphine reduces sympathetic tone via μ-opioid receptors.
Symptoms
Lower blood pressure, postural dizziness, fatigue. Older patients: fall risk. With additional antihypertensives: bradycardia (pulse below 60/min).
Management
The combination is acceptable in palliative care and acute coronary syndrome (standard practice). Titrate morphine from a low dose; monitor pulse, blood pressure, and saturation.