Isosorbide Mononitrate – What You Need to Know

If you’ve been prescribed a pill called isosorbide mononitrate, you probably have angina or another heart‑related condition. It’s a nitrate that helps keep blood vessels relaxed so more blood can flow to your heart. In plain English, it makes the heart’s workload easier and reduces chest pain.

Most people take it once a day, and the dose is usually low at first. Your doctor will adjust it based on how you feel and any side effects you notice. It’s important to keep the timing consistent – taking it at the same hour each day helps maintain steady blood levels.

How to Take Isosorbide Mononitrate Safely

Never crush, chew, or split the tablets unless your doctor says it’s OK. The extended‑release form is designed to release the medicine slowly, and breaking it can cause a sudden surge in blood pressure.

Store the tablets in a cool, dry place away from direct sunlight. If you miss a dose, take it as soon as you remember, but if it’s almost time for the next dose, skip the missed one – don’t double up.

Alcohol can increase the risk of dizziness or low blood pressure, so limit drinking while you’re on this medication. Also, avoid taking other nitrate drugs (like nitroglycerin) unless your doctor specifically approves it, because the combination can cause a dangerous drop in blood pressure.

Common Side Effects and When to Call a Doctor

Most side effects are mild. You might feel a headache, feel light‑headed, or notice a slight flushing of the skin. These usually ease after a few days as your body gets used to the medicine.

Serious reactions are rare but need immediate attention. If you experience a severe headache that won’t go away, fainting, rapid heartbeat, or any sign of an allergic reaction such as rash, swelling, or trouble breathing, call your doctor right away.

Regular check‑ups are key. Your doctor may want to monitor your blood pressure and heart rate, especially when you start the medication or change the dose.

In summary, isosorbide mononitrate can make a big difference in managing angina when taken correctly. Stick to the prescribed schedule, watch for side effects, and keep your healthcare provider in the loop. Doing so will help you get the most benefit with the fewest problems.