By Medically reviewed by hellodoktor

Generic Name: Klonopin Brand Name(s): Generics only. No brands available.


What is Klonopin® (clonazepam) used for?

Klonopin® is a benzodiazepine. Clonazepam affects chemicals in the brain that may be unbalanced. Clonazepam is also a seizure medicine, also called an anti-epileptic drug.

Klonopin® is used to treat certain seizure disorders (including absence seizures or Lennox-Gastaut syndrome) in adults and children.

Klonopin® is also used to treat panic disorder (including agoraphobia) in adults.

How should I take Klonopin® (clonazepam)?

Take Klonopin® exactly as prescribed by your doctor. Follow all directions on your prescription label. Your doctor may occasionally change your dose to make sure you get the best results. Do not use this medicine in larger or smaller amounts or for longer than recommended.

Klonopin® may be habit-forming. Never share this medicine with another person, especially someone with a history of drug abuse or addiction. Keep the medication in a place where others cannot get to it.

Misuse of habit-forming medicine can cause addiction, overdose, or death. Selling or giving away this medicine is against the law.

Klonopin® should be used for only a short time. Do not take this medication for longer than 9 weeks without your doctor’s advice.

Swallow the tablet whole, with a full glass of water.

If you use this medicine long-term, you may need frequent medical tests.

Do not stop using Klonopin® suddenly or you could have unpleasant withdrawal symptoms, including a seizure (convulsions). Ask your doctor how to safely stop using this medicine.

Call your doctor if this medicine seems to stop working as well in treating your seizures or anxiety symptoms.

How do I store Klonopin® (clonazepam)?

Klonopin® is best stored at room temperature away from direct light and moisture. To prevent drug damage, you should not store Klonopin® in the bathroom or the freezer. There may be different brands of Klonopin® that may have different storage needs. It is important to always check the product package for instructions on storage, or ask your pharmacist. For safety, you should keep all medicines away from children and pets.

You should not flush Klonopin® down the toilet or pour them into a drain unless instructed to do so. It is important to properly discard this product when it is expired or no longer needed. Consult your pharmacist for more details about how to safely discard your product.

Precautions & warnings

What should I know before using Klonopin® (clonazepam)?

Before using this drug, tell your doctor if:

  • You are pregnant or breastfeeding. This is because, while you are expecting or feeding a baby, you should only take medicines on the recommendation of a doctor.
  • You are taking any other medicines. This includes any medicines you are taking which are available to buy without a prescription, such as herbal and complementary medicines.
  • You have allergy with any of active or inactive ingredients of Klonopin® or other medications.
  • You have any other illnesses, disorders, or medical conditions.
  • You have a history of allergic reaction to any benzodiazepine, such as diazepam (Valium), alprazolam (Xanax), lorazepam (Ativan), chlordiazepoxide, flurazepam, and others.

You should not use Klonopin® if you have narrow-angle glaucoma or severe liver disease, or if you are allergic to Valium or a similar medicine.

Call your doctor if you have any new or worsening symptoms of depression, unusual changes in behavior, or thoughts about suicide or hurting yourself.

Do not drink alcohol while taking this medicine. Clonazepam may be habit-forming.

Some people have thoughts about suicide when taking Klonopin®. Your doctor should check your progress at regular visits. Your family or other caregivers should also be alert to changes in your mood or symptoms.

Is it safe during pregnancy or breastfeeding?

There are no adequate studies in women for determining risk when using Klonopin® during pregnancy or while breastfeeding. Please always consult with your doctor to weigh the potential benefits and risks before taking Klonopin®. Klonopin® is pregnancy risk category D, according to the US Food and Drug Administration (FDA).

FDA pregnancy risk category reference below:

  • A=No risk
  • B=No risk in some studies
  • C=There may be some risk
  • D=Positive evidence of risk
  • X=Contraindicated
  • N=Unknown

Side effects

What side effects can occur from Klonopin® (clonazepam)?

Common side effects may include:

  • Feeling tired or depressed
  • Drowsiness
  • Dizziness
  • Memory problems
  • Problems with balance or coordination

Call your doctor at once if you have:

  • New or worsening seizures
  • Severe drowsiness
  • Unusual changes in mood or behavior
  • Confusion, aggression, hallucinations
  • Thoughts of suicide or hurting yourself
  • Weak or shallow breathing
  • Pounding heartbeats or fluttering in your chest
  • Unusual or involuntary eye movements

Report any new or worsening symptoms to your doctor, such as mood or behavior changes, anxiety, panic attacks, trouble sleeping, or if you feel impulsive, irritable, agitated, hostile, aggressive, restless, hyperactive (mentally or physically), more depressed, or have thoughts about suicide or hurting yourself.

Get emergency medical help if you have signs of an allergic reaction to Klonopin® hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Not everyone experiences these side effects. There may be some side effects not listed above. If you have any concerns about a side-effect, please consult your doctor or pharmacist.


What drugs may interact with Klonopin® (clonazepam)?

Klonopin® may interact with other drugs that you are currently taking, which can change how your drug works or increase your risk for serious side effects. To avoid any potential drug interactions, you should keep a list of all the drugs you are using (including prescription drugs, nonprescription drugs, and herbal products) and share it with your doctor and pharmacist. For your safety, do not start, stop, or change the dosage of any drugs without your doctor’s approval.

Product that may interact with this drug is a narcotic (opioid) medication.

Does food or alcohol interact with Klonopin® (clonazepam)?

Klonopin® may interact with food or alcohol by altering the way the drug works or increase the risk for serious side effects. Please discuss with your doctor or pharmacist any potential food or alcohol interactions before using this drug.

What health conditions may interact with Klonopin® (clonazepam)?

Klonopin® may interact with your health condition. This interaction may worsen your health condition or alter the way the drug works. It is important to always let your doctor and pharmacist know all the health conditions you currently have.

Health conditions that may interact with this drug are:

  • Narrow-angle glaucoma
  • Severe liver disease
  • Kidney or liver disease
  • Glaucoma
  • Asthma, emphysema, bronchitis, chronic obstructive pulmonary disorder (COPD), or other breathing problems
  • Porphyria (a genetic enzyme disorder that causes symptoms affecting the skin or nervous system)
  • A history of depression or suicidal thoughts or behavior
  • A history of mental illness, psychosis, or addiction to drugs or alcohol


The information provided is not a substitute for any medical advice. You should ALWAYS consult with your doctor or pharmacist before using Klonopin® (clonazepam).

What is the dose of Klonopin® (clonazepam) for an adult?

Usual Adult Dose for Seizure Prophylaxis:

The recommended dose is 1.5 mg orally per day divided into 3 doses. This may be increased in increments of 0.5 mg to 1 mg every 3 days until seizures are adequately controlled or until side effects preclude any further increase.

Maximum dose: 20 mg orally per day.

Usual Adult Dose for Panic Disorder:

Initial dose: 0.25 mg orally 2 times per day.

Maintenance dose: 1 mg orally per day.

Maximum dose: 4 mg orally per day.

What is the dose of Klonopin® (clonazepam) for a child?

Usual Pediatric Dose for Seizure Prophylaxis:

Up to 10 years of age or 30 kg of body weight: 0.01 mg/kg/day to 0.05 mg/kg/day orally administered in 2 or 3 divided doses.

10 years or older or 30 kg and over: See adult dosing.

How is Klonopin® (clonazepam) available?

Klonopin® is available in the following dosage forms and strengths:

  • Tablets: Clonazepam 0.5mg

What should I do in case of an emergency or overdose?

In case of an emergency or an overdose, call your local emergency services or go to your nearest emergency room.

What should I do if I miss a dose?

If you miss a dose of Klonopin®, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and take your regular dose as scheduled. Do not take a double dose.

Hello Health Group does not provide medical advice, diagnosis or treatment.

Review Date: July 7, 2017 | Last Modified: September 13, 2019

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