What is clonidine (oral)?
Clonidine lowers blood pressure by decreasing the levels of certain chemicals in your blood.
This allows your blood vessels to relax and your heart to beat more slowly and easily.
Clonidine is used to treat hypertension (high blood pressure). It is sometimes used together
with other blood pressure medications.
Clonidine may also be used for other purposes not listed in this medication guide.
What should I discuss with my healthcare provider before taking clonidine (oral)?
You should not take this medication if you are allergic to clonidine.
If you have certain conditions, you may need a dose adjustment or special tests to safely use
this medication. Before you take clonidine, tell your doctor if you have:
-
heart disease or severe coronary artery disease;
-
a heart rhythm disorder;
-
a history of heart attack or stroke;
-
kidney disease; or
-
if you have ever had an allergic reaction to a clonidine
transdermal skin patch (Catapres TTS).
FDA pregnancy category C. It is not known if clonidine is harmful to an
unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment.
Clonidine can pass into breast milk and may harm a nursing baby. Do not take this
medication without telling your doctor if you are breast-feeding a baby.
Do not give this medication to a child younger than 12 years old.
How should I take clonidine (oral)?
Take this medication exactly as it was prescribed for you. Do not take the medication in larger
amounts, or take it for longer than recommended by your doctor. Follow the instructions on your
prescription label.
Your doctor may occasionally change your dose to make sure you get the best results from this
medication.
Clonidine is usually taken in the morning and at bedtime. Follow your doctor's instructions.
If you need to have any type of surgery, tell the surgeon ahead of time that you are taking
clonidine. You may need to stop using the medicine for a short time.
Do not stop taking this medication suddenly without first talking to your doctor. Stopping
this medication suddenly can cause nervousness, agitation, headache, tremors, severe high blood
pressure, or life-threatening symptoms. Talk with your doctor about how to avoid withdrawal
symptoms when you stop taking clonidine.
Keep using this medicine as directed, even if you feel well. High blood pressure often has no
symptoms. You may need to use blood pressure medication for the rest of your life.
Store this medication at room temperature away from moisture, heat, and light.
What happens if I miss a dose of clonidine (oral)?
Take the missed dose as soon as you remember. If it is almost time for your next dose, wait
until then to take the medicine and skip the missed dose.
Do not
take extra medicine
to make up the missed dose.
Where can I get more information about clonidine (oral)?
Your pharmacist has information about clonidine (oral) written for health professionals that you may read.
What are the possible side effects of clonidine (oral)?
Get emergency medical help if you have any of these
signs of an allergic
reaction:
hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have any of these serious side effects:
-
fast or pounding heartbeats;
-
a very slow heart rate (fewer than 60 beats per minute);
-
feeling short of breath, even with mild exertion;
-
swelling, rapid weight gain;
-
confusion, hallucinations;
-
fever, pale skin;
-
urinating less than usual or not at all; or
-
feeling like you might pass out.
Less serious side effects may include:
-
feeling dizzy, drowsy, tired, or nervous;
-
dry mouth;
-
dry or burning eyes, blurred vision;
-
headache, muscle or joint pain;
-
nausea, vomiting, constipation, loss of appetite;
-
sleep problems (insomnia);
-
urinating more at night;
-
mild skin rash or itching; or
-
decreased sex drive, impotence.
This is not a complete list of side effects and others may occur. Tell your
doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.
What is the most important information I should know about clonidine (oral)?
Before you take clonidine, tell your doctor if you have heart disease or severe coronary artery
disease, a heart rhythm disorder, a history of heart attack or stroke, kidney disease, or if you have ever
had an allergic reaction to a clonidine transdermal skin patch (Catapres TTS).
Do not stop taking this medication suddenly without first talking to your doctor. Stopping
this medication suddenly can cause nervousness, agitation, headache, tremors, severe high blood
pressure, or life-threatening symptoms. Talk with your doctor about how to avoid withdrawal
symptoms when you stop taking clonidine.
Avoid drinking alcohol. It can increase some of the side effects of clonidine.
Tell your doctor about all the prescription and over-the-counter medications you use. This
includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using
a new medication without telling your doctor.
Clonidine can cause side effects that may impair your thinking or reactions. Be careful if
you drive or do anything that requires you to be awake and alert.
Keep using this medicine as directed, even if you feel well. High blood pressure often has no
symptoms. You may need to use blood pressure medication for the rest of your life.
What should I avoid while taking clonidine (oral)?
Avoid drinking alcohol. It can increase some of the side effects of clonidine.
Clonidine can cause side effects that may impair your thinking or reactions. Be careful if
you drive or do anything that requires you to be awake and alert.
What other drugs will affect clonidine (oral)?
Before taking clonidine, tell your doctor if you regularly use other medicines that make you
sleepy (such as cold or allergy medicine, narcotic pain medicine, sleeping pills, muscle relaxers, and
medicine for seizures, depression, or anxiety). They can add to sleepiness caused by clonidine.
Tell your doctor about all other medications you use, especially:
-
clonidine transdermal skin patches (Catapres TTS);
-
digitalis (digoxin, Lanoxin, Lanoxicaps);
-
an antidepressant such as amitriptyline (Elavil, Etrafon);
-
a beta-blocker such as atenolol (Tenormin), carvedilol
(Coreg), labetalol (Normodyne, Trandate), metoprolol (Lopressor, Toprol), nadolol (Corgard),
propranolol (Inderal, InnoPran), sotalol (Betapace), and others;
-
a calcium channel blocker such as amlodipine (Norvasc),
diltiazem (Tiazac, Cartia, Cardizem), felodipine (Plendil), nifedipine (Procardia, Adalat),
verapamil (Calan, Covera, Isoptin, Verelan), and others; or
-
any other drugs to treat high blood pressure or heart
problems.
This list is not complete and there may be other drugs that can interact with
clonidine. Tell your doctor about all the prescription and over-the-counter medications you use. This
includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using
a new medication without telling your doctor.
What happens if I have an overdose of clonidine (oral)?