Metoprolol
Lopressor is a brand-name beta-blocker medication containing metoprolol tartrate. It is primarily prescribed to treat high blood pressure, chest pain (angina), and heart failure, and may be used after a heart attack to improve survival. The medication works by blocking beta-adrenergic receptors in the heart, reducing heart rate and the force of contractions, which helps lower blood pressure and decrease the heart's workload.
Lopressor is a beta-blocker used to treat high blood pressure, angina, and heart conditions by reducing heart rate and workload.
Key facts at a glance
- RxNorm
- 203344
- Generic
- Lopressor
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Lopressor is used to treat hypertension (high blood pressure), angina pectoris (chest pain), symptomatic heart failure, and to reduce mortality after a heart attack. It may also be prescribed for certain irregular heart rhythms and to prevent migraines.
Lopressor contains metoprolol tartrate, a beta-1 selective adrenergic receptor blocker. It works by blocking beta-adrenergic receptors in the heart, which slows the heart rate, reduces the force of heart contractions, and decreases blood pressure. This reduces the heart's oxygen demand and overall workload.
Lopressor should not be stopped abruptly, as this may worsen chest pain or trigger a heart attack. It may mask symptoms of low blood sugar in diabetic patients. Common side effects include fatigue, dizziness, and slow heartbeat. Patients with certain heart conditions, asthma, or severe liver disease should use this medication with caution or avoid it entirely. Always follow your healthcare provider's dosing instructions carefully.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed July 26, 2026. · Read our editorial policy