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Clonidine Extended-Release Suspension (ADHD)

What is this medication?

CLONIDINE (KLOE ni deen) treats attention-deficit hyperactivity disorder (ADHD). It works by improving focus and reducing impulsive behavior.

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This medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions.

COMMON BRAND NAME(S): Onyda XR

What should I tell my care team before I take this medication?

They need to know if you have any of these conditions:

  • Have had a stroke
  • Heart disease
  • High or low blood pressure
  • Irregular heartbeat or rhythm
  • Kidney disease
  • An unusual or allergic reaction to clonidine, other medications, foods, dyes, or preservatives
  • Pregnant or trying to get pregnant
  • Breastfeeding

How should I use this medication?

Take this medication by mouth. Take it as directed on the prescription label at the same time every day. Shake gently before using. Use a specially marked oral syringe, spoon, or dropper to measure each dose. Ask your pharmacist if you do not have one. Household spoons are not accurate. You can take it with or without food. If it upsets your stomach, take it with food. Keep taking it unless your care team tells you to stop.

This medication comes with INSTRUCTIONS FOR USE. Ask your pharmacist for directions on how to use this medication. Read the information carefully. Talk to your pharmacist or care team if you have questions.

Talk to your care team about the use of this medication in children. While it may be prescribed for children as young as 6 years for selected conditions, precautions do apply.

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Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once.

NOTE: This medicine is only for you. Do not share this medicine with others.

What if I miss a dose?

If you miss a dose, skip it. Take the next dose at the normal time. Do not take extra or 2 doses at the same time to make up for the missed dose.

What may interact with this medication?

  • Alcohol
  • Benzodiazepines, such as alprazolam, diazepam, lorazepam
  • Certain medications for depression, such as amitriptyline or trazodone
  • Certain medications for blood pressure, heart disease, irregular heartbeat
  • Certain medications for seizures, such as phenobarbital or primidone
  • Medications that cause drowsiness before a procedure, such as propofol
  • Medications that help you fall asleep
  • Medications that relax muscles
  • Opioids for pain or cough
  • Phenothiazines, such as chlorpromazine, prochlorperazine, thioridazine

This list may not describe all possible interactions. Give your health care provider a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.

What should I watch for while using this medication?

Visit your care team for regular checks on your progress. Tell your care team if your symptoms do not start to get better or if they get worse.

This medication may affect your coordination, reaction time, or judgment. Do not ride a bike, do gymnastics, drive, or operate machinery until you know how this medication affects you. Sit up or stand slowly to reduce the risk of dizzy or fainting spells. Drinking alcohol with this medication can increase the risk of these side effects.

Avoid getting dehydrated or too hot. This decreases the risk of feeling faint or lightheaded and passing out.

Do not suddenly stop taking this medication. You may develop a severe reaction. Your care team will tell you how much medication to take. If your care team wants you to stop the medication, the dose may be slowly lowered over time to avoid any side effects.

Your mouth may get dry. Chewing sugarless gum or sucking hard candy and drinking plenty of water may help. Contact your care team if the problem doesn't go away or is severe.

Talk to your care team before breastfeeding. Changes to your treatment plan may be needed. If you breastfeed while taking this medication, seek medical care right away if you notice the child has slow or noisy breathing, is unusually sleepy or not able to wake up, or is limp.

This medication may cause infertility. Talk to your care team if you are concerned about your fertility.

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What side effects may I notice from receiving this medication?

Side effects that you should report to your care team as soon as possible:

  • Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat
  • Low blood pressure—dizziness, feeling faint or lightheaded, blurry vision
  • Slow heartbeat—dizziness, feeling faint or lightheaded, confusion, trouble breathing, unusual weakness or fatigue

Side effects that usually do not require medical attention (report these to your care team if they continue or are bothersome):

  • Constipation
  • Dizziness
  • Drowsiness
  • Dry mouth
  • Fatigue
  • Headache
  • Stomach pain
  • Trouble sleeping

This list may not describe all possible side effects. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Where should I keep my medication?

Keep out of the reach of children and pets.

Store at room temperature between 20 and 25 degrees C (68 and 77 degrees F). Keep this medication in the original container. Protect from light. Get rid of any unused medication as instructed on the label or after the expiration date, whichever is first.

To get rid of medications that are no longer needed or have expired:

  • Take the medication to a take-back program. Check with your pharmacy or law enforcement to find a location.
  • If you cannot return the medication, check the label or package insert to see if the medication should be thrown out in the garbage or flushed down the toilet. If you are not sure, ask your care team. If it is safe to put it in the trash, pour the medication out of the container. Mix it with cat litter, dirt, coffee grounds, or another unwanted substance. Seal the mixture in a bag or container. Put it in the trash.

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NOTE: This sheet is a summary. It may not cover all possible information. If you have questions about this medicine, talk to your doctor, pharmacist, or health care provider.

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Note: Introduction and Additional Common Questions written and medically approved by Cleveland Clinic professionals.

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