Clonazepam. Drug and Patient Information. Dosage. Overdose. Generic or Brand Clonazepam. For Professionals and Consumers.

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Clonazepam is used alone or along with other medications to treat convulsive disorders such as epilepsy. It is also prescribed for panic disorder—unexpected attacks of overwhelming panic accompanied by fear of recurrence. Clonazepam belongs to a class of drugs known as benzodiazepines.

Brand names: Klonopin & Rivotril

Generic name: Clonazepam


Most important fact about Clonazepam

Clonazepam works best when there is a constant amount in the bloodstream. To keep blood levels as constant as possible, take your doses at regularly spaced intervals and try not to miss any.

How should you take Clonazepam?

Take Clonazepam exactly as prescribed. If you are taking it for panic disorder and you find it makes you sleepy, your doctor may recommend a single dose at bedtime.

If you miss a dose of Clonazepam

If it is within an hour after the missed time, take the dose as soon as you remember. If you do not remember until later, skip the dose and go back to your regular schedule. Never take 2 doses at the same time.

Storage instructions for Clonazepam

Store at room temperature away from heat, light, and moisture.

What side effects may occur when taking Clonazepam?

Side effects cannot be anticipated. If any develop or change in intensity, inform your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking Clonazepam.

Side effects in seizure disorders may include:

Behavior problems, drowsiness, lack of muscular coordination

Side effects in panic disorder may include:

Allergic reaction, constipation, coordination problems, depression, dizziness, fatigue, inflamed sinuses or nasal passages, flu, memory problems, menstrual problems, nervousness, reduced thinking ability, respiratory infection, sleepiness, speech problems, vaginal inflammation

Clonazepam can also cause aggressive behavior, agitation, anxiety, excitability, hostility, irritability, nervousness, nightmares, sleep disturbances, and vivid dreams.

Side effects due to a rapid decrease in dose or abrupt withdrawal from Clonazepam may include:

Abdominal and muscle cramps, behavior disorders, convulsions, depressed feeling, hallucinations, restlessness, sleeping difficulties, tremors

Why should Clonazepam not be prescribed?

If you are sensitive to or have ever had an allergic reaction to Clonazepam or similar drugs, such as chlordiazepoxide and diazepam, you should not take Clonazepam. Make sure your doctor is aware of any reactions you have experienced.

You should not take Clonazepam if you have severe liver disease or the eye condition known as acute narrow-angle glaucoma.

Special warnings about Clonazepam

Clonazepam may cause you to become drowsy or less alert; therefore, you should not drive or operate dangerous machinery or participate in any hazardous activity that requires full mental alertness until you know how Clonazepam affects you.

If you have several types of seizures, this drug may increase the possibility of grand mal seizures (epilepsy). Inform your doctor if this occurs. Your doctor may wish to prescribe an additional anticonvulsant drug or increase your dose.

Clonazepam can be habit-forming and can lose its effectiveness as you build up a tolerance to it. You may experience withdrawal symptoms—such as convulsions, hallucinations, tremor, and abdominal and muscle cramps—if you stop using Clonazepam abruptly. Discontinue or change your dose only in consultation with your doctor.

Possible food and drug interactions when taking Clonazepam

Clonazepam slows the nervous system and its effects may be intensified by alcohol. Do not drink while taking Clonazepam.

If Clonazepam is taken with certain other drugs, the effects of either could be increased, decreased, or altered.

It is especially important to check with your doctor before combining Clonazepam with the following:

Anti anxiety drugs such as diazepam
Antidepressant drugs such as amitriptyline, imipramine, phenelzine, and tranylcypromine
Barbiturates such as phenobarbital
Major tranquilizers such as chlorpromazine, haloperidol, and thiothixene
Narcotic pain relievers such as meperidine and oxycodone
Oral antifungal drugs such as amphotericin B and clotrimazole
Other anticonvulsants such as phenytoin and valproic acid
Sedatives such as triazolam

Special information if you are pregnant or breastfeeding with Clonazepam

Avoid Clonazepam if at all possible during the first 3 months of pregnancy; there is a risk of birth defects. When taken later in pregnancy, Clonazepam can cause other problems, such as withdrawal symptoms in the newborn. If you are pregnant or plan to become pregnant, inform your doctor immediately. Clonazepam appears in breast milk and could affect a nursing infant. Mothers taking Clonazepam should not breastfeed.

Recommended dosage for Clonazepam



The starting dose should be no more than 1.5 milligrams per day, divided into 3 doses. Your doctor may increase your daily dosage by 0.5 to 1 milligram every 3 days until your seizures are controlled or the side effects become too bothersome. The most you should take in 1 day is 20 milligrams.


The starting dose for infants and children up to 10 years old or up to 66 pounds should be 0.01 to 0.03 milligram—no more than 0.05 milligram—per 2.2 pounds of body weight daily. The daily dosage should be given in 2 or 3 smaller doses. Your doctor may increase the dose by 0.25 to 0.5 milligram every 3 days until seizures are controlled or side effects become too bad. If the dose cannot be divided into 3 equal doses, the largest dose should be given at bedtime. The maximum maintenance dose is 0.1 to 0.2 milligram per 2.2 pounds daily.



The starting dose is 0.25 milligram twice a day. After 3 days, your doctor may increase the dose to 1 milligram daily. Some people need as much as 4 milligrams a day.


For panic disorder, safety and effectiveness have not been established in children under age 18.

Older Adults

Clonazepam tends to build up in the body if the kidneys are weak—a common problem among older adults. Higher doses of the drug also tend to cause more drowsiness and confusion in older patients. People over age 65 are therefore started on low doses of Clonazepam and watched with extra care.

Overdosage and Clonazepam

Any medication taken in excess can have serious consequences. If you suspect an overdose of Clonazepam, seek medical attention immediately.

The symptoms of Clonazepam overdose may include:

Coma, confusion, sleepiness, slowed reaction time.