Carvedilol

About Carvedilol

Carvedilol is a nonselective beta blocker that also blocks alpha-1 receptors, slowing the heart and relaxing blood vessels. Its labels cover mild to severe chronic heart failure, usually alongside diuretics, ACE inhibitors and digitalis; left ventricular dysfunction in clinically stable people after a heart attack, to lower the risk of cardiovascular death; and high blood pressure. Effectiveness under age 18 has not been established. In heart failure, tablets start at 3.125 mg twice a day for two weeks and rise, at intervals of at least two weeks, to 6.25, 12.5 and 25 mg twice a day as tolerated; after a heart attack and for blood pressure they start at 6.25 mg twice a day, with blood pressure doses capped at 50 mg a day. Coreg CR is taken once a day, starting at 10 or 20 mg, up to 80 mg.

There is no boxed warning. In people with angina, severe worsening of angina, heart attacks and ventricular arrhythmias have followed abrupt stopping of beta blockers, so carvedilol is stopped over one to two weeks whenever possible, including when it is taken only for blood pressure or heart failure. It must not be taken with bronchial asthma or related conditions; second- or third-degree heart block, sick sinus syndrome or a severely slow heartbeat (unless a permanent pacemaker is in place); cardiogenic shock or decompensated heart failure needing intravenous inotropes; severe liver impairment; or a past serious allergy to it. The dose is lowered if the pulse drops below 55, low blood pressure and fainting are most likely in the first 30 days, while the dose is being raised, and it can hide the signs of low blood sugar and make it more severe or prolonged. Dizziness, tiredness, low blood pressure, diarrhea, high blood sugar, weakness, a slow heartbeat and weight gain are common in heart failure.

Coreg CR contains carvedilol phosphate and is converted from tablets by a table in its label: 3.125 mg tablets twice a day match 10 mg capsules once a day, 6.25 mg match 20 mg, 12.5 mg match 40 mg and 25 mg match 80 mg, and older adults switching from 25 mg tablets twice a day start at 40 mg. Capsules are not crushed, chewed or divided. Food slows absorption of the tablets and lowers the chance of dizziness on standing. An eye surgeon needs to know about carvedilol before cataract surgery because of intraoperative floppy iris syndrome, and in people with heart failure and diabetes, blood sugar is checked when the dose starts, changes or stops. Beta blockers in the third trimester may cause low blood pressure, a slow heartbeat, low blood sugar and slowed breathing in the newborn, and there are no data on carvedilol in human milk.

Taking Carvedilol

How to take it

Tablets twice a day, and Coreg CR once a day in the morning, always with food. Swallow capsules whole, or sprinkle all the beads on a spoonful of cool or room-temperature applesauce and eat it right away. Get up slowly, resting your feet on the floor for a few minutes before standing.

If you miss a dose

Take it as soon as you remember, unless it is almost time for the next dose; then skip the missed dose. Do not take a double dose.

Storage

At room temperature (tablets below 86°F, or 30°C), tightly closed in a light-resistant container, away from heat and moisture and out of reach of children.

Interactions to know about

Quinidine, fluoxetine, paroxetine and propafenone may raise carvedilol levels and rifampin lowers them; it raises digoxin and cyclosporine levels and can strengthen insulin and diabetes pills. Verapamil, diltiazem and amiodarone add to slowing of the heart, and if clonidine is being stopped, carvedilol is stopped first.

This summarizes the official prescribing information. Your prescriber’s and pharmacist’s instructions, and the leaflet that comes with your medicine, take priority.

Why the cash price for Carvedilol differs from pharmacy to pharmacy

Generic carvedilol tablets have many makers, but each pharmacy sets its own cash price, including its dispensing fee, so quotes for the same tablet can differ; a prescription that names Coreg and blocks substitution is priced as a brand.

The capsules have few generic makers, and a prescription naming Coreg CR without allowing substitution is priced as a brand.

Ways to pay less for Carvedilol without insurance

• Ask for generic carvedilol, and make sure the prescription does not block substitution.
• Ask whether carvedilol is on the pharmacy’s flat-price generic list, and compare more than one pharmacy, especially for the capsules.
• While the dose is being raised, ask for quantities that match each step; once it is settled, ask for a ninety-day supply.
• If the capsules are quoted high, ask the prescriber whether twice-daily tablets would suit you.
• Upload the prescription to Script Unlock so licensed pharmacies can quote their cash price. You pay the pharmacy directly.

Questions to ask your pharmacist about Carvedilol

1. 1.Is my prescription for the twice-daily tablets or the once-daily capsules?
2. 2.What pulse rate or dizziness should make me call while my dose is being raised?
3. 3.Which signs of worsening heart failure, such as weight gain or shortness of breath, should I report?
4. 4.Does it interact with my diabetes, heart rhythm or transplant medicines?

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