| Why
is Imdur prescribed?
Imdur is used to prevent or treat chest pain (angina). It works
by relaxing the blood vessels to the heart, so the blood and oxygen
supply to the heart is increased.
Isosorbide
mononitrate is sometimes prescribed for other uses; ask your doctor
or pharmacist for more information.
How
should Imdur be used?
Imdur comes as a regular, sublingual, chewable, and extended-release
(long-acting) tablet and extended-release (long-acting) capsule
to be taken by mouth. The tablet usually is taken every 6 hours.
The extended-release tablet usually is taken one or two times a
day. The extended-release capsule usually is taken every 8-12 hours.
Do not crush, chew, or divide the extended-release tablets or capsules.
The sublingual or chewable tablet is used as needed to relieve chest
pain that has already started or to prevent pain before activities
known to provoke attacks (e.g., climbing stairs, sexual activity,
heavy exercise, or being outside in cold weather). The chewable
tablet also may be used every 2-3 hours to prevent chest pain. Follow
the directions on your label carefully, and ask your
doctor or pharmacist to explain any part you do not understand.
Take Imdur exactly as directed. Do not take more or less of it or
take it more often than prescribed by your doctor. Imdur controls
chest pain but does not cure it. Continue to take Imdur even if
you feel well. Do not stop taking Imdur without talking to your
doctor. Stopping the drug abruptly may cause chest pain.
Imdur
can lose its effectiveness when used for a long time. This effect
is called tolerance. If your angina attacks happen more often, last
longer, or are more severe, call your doctor.
If
you are using Imdur sublingual or chewable tablets for acute chest
pain, you should carry the tablets with you at all times. If you
are taking Imdur and your chest pain is not relieved within 5-10
minutes, take another dose. Call for emergency assistance or go
to a hospital emergency department if pain persists after you have
taken three tablets (at 5-10-minute intervals) and 15-30 minutes
have passed.
When
an attack occurs, sit down. If you use chewable tablets, chew a
tablet thoroughly and swallow it. To use the sublingual tablets,
place a tablet under your tongue or between your cheek and gum and
allow it to dissolve. Do not swallow the tablet. Try not to swallow
saliva too often until the tablet dissolves.
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What
special precautions should I follow?
Before
taking imdur, tell
your doctor and pharmacist if you are allergic to Imdur; nitroglycerin
tablets, patches, or ointment; or any other drugs.
tell your doctor and pharmacist what
medications you are taking, especially aspirin; beta blockers such
as atenolol (Tenormin), carteolol (Cartrol), labetalol (Trandate,
Normodyne), metoprolol (Lopressor), nadolol (Corgard), propranolol
(Inderal), sotalol (Betapace), and timolol (Blocadren); calcium
channel blockers such as amlodipine (Norvasc), diltiazem (Cardizem),
felodipine (Plendil), isradipine (DynaCirc), nifedipine (Procardia),
and verapamil (Calan, Isoptin); dihydroergotamine (D.H.E. 45); sildenafil
(Viagra),and vitamins.
tell your doctor if you have or have ever had low red blood cell
counts (anemia), glaucoma, or recent head trauma.
tell your doctor if you are pregnant, plan to become pregnant, or
are breast-feeding. If you become pregnant while taking Isosorbide
mononitrate, call your doctor.
if you are having surgery, including dental surgery, tell the doctor
or dentist that you are taking Isosorbide mononitrate.
you should know that this drug may make you drowsy or dizzy. Do
not drive a car or operate machinery until you know how it affects
you.
tell your doctor if you consume large amounts of alcohol regularly
and ask about the safe use of alcoholic beverages while you are
taking Isosorbide mononitrate. Alcohol can make the side effects
from Isosorbide mononitrate worse.
What should I do if I forget a dose?
Take the missed dose as soon as you remember it. However, if it
is almost time for the next dose, skip the missed dose and continue
your regular dosing schedule. Do not take a double dose to make
up for a missed one.
What
side effects can Imdur cause?
Side effects from Isosorbide mononitrate are common. Tell your doctor
if any of these symptoms are severe or do not go away:
headache
rash
dizziness
upset stomach
headache
flushing (feeling of warmth)
If you experience any of the following symptoms, call your doctor
immediately:
blurred
vision
dry mouth
chest pain
fainting
What storage conditions are needed for Imdur?
Keep Isosorbide mononitrate in the container it came in, tightly
closed, and out of reach of children. Store it at room temperature
and away from excess heat and moisture (not in the bathroom). Keep
sublingual and chewable tablets in the original container. Do not
open a container of sublingual or chewable isosorbide until you
need a dose. Do not use tablets that are more than 12 months old.
Throw away any medication that is outdated or no longer needed.
Talk to your pharmacist about the proper disposal of your medication.
What
other information should I know?
Keep all appointments with your doctor and the laboratory.
Imdur
regular and extended-release tablets or capsules should not be used
for acute angina attacks. Continue to use Imdur sublingual or chewable
tablets to relieve chest pain that has already started.
If
headache continues, ask your doctor if you may take acetaminophen.
Your Imdur dose may need to be adjusted. Do not take aspirin or
any other medication for headache while using Imdur unless you doctor
tells you to.
The
tablets may cause a sweet, tingling sensation when placed under
your tongue. This sensation is not an accurate indicator of drug
strength; the absence of a tingling sensation does not mean that
the drug is not working.
Do
not let anyone else take your medication. Ask your pharmacist any
questions you have.
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