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Klonopin Side Effects

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Common Klonopin Side Effects


The most commonly reported Klonopin side effects (click to view or check a box to report):

Anxiety (86)
Depression (73)
Convulsion (67)
Dizziness (56)
Insomnia (55)
Nausea (52)
Pain (48)
Headache (41)
Feeling Abnormal (40)
Fatigue (40)
Diarrhoea (38)
Somnolence (33)
Vomiting (32)
Asthenia (29)
Amnesia (29)
Suicide Attempt (28)
Confusional State (28)
Malaise (26)
Tremor (26)
Overdose (26)

➢ More



If you or someone in your family has experienced a serious side effect to a health product, you are encouraged to report the experience to your health care professional (e.g. physician, pharmacist). You could also complete a copy of the side effect reporting form or report your side effect to FDA.

Klonopin Side Effects Reported to FDA



Klonopin Side Effect Report#9992911
Somnolence, Dizziness, Dizziness
This is a report of a 44-year-old female patient (weight: NA) from Country Not Specified, suffering from the following health symptoms/conditions: convulsion,anxiety,asthma,endometriosis, who was treated with Klonopin (dosage: NA, start time: 1999), combined with:
  • Lexapro
  • Singulair
  • Lupron Depot (11.25 Mg/3 Month)
  • Lupron Depot
  • Lyrica
and developed a serious reaction and side effect(s): Somnolence, Dizziness, Dizziness after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Klonopin treatment in female patients, resulting in Somnolence side effect.
Klonopin Side Effect Report#9937096
Cervix Carcinoma
This report suggests a potential Klonopin Cervix Carcinoma side effect(s) that can have serious consequences. A 62-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: anxiety and used Klonopin (dosage: NA) starting NS. After starting Klonopin the patient began experiencing various side effects, including: Cervix CarcinomaAdditional drugs used concurrently: NA. Although Klonopin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Cervix Carcinoma, may still occur.
Klonopin Side Effect Report#9922489
Withdrawal Syndrome
This Withdrawal Syndrome problem was reported by a consumer or non-health professional from US. A 31-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: insomnia. On NS this consumer started treatment with Klonopin (dosage: 12 Years Plus). The following drugs were being taken at the same time: NA. When using Klonopin, the patient experienced the following unwanted symptoms/side effects: Withdrawal SyndromeAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Withdrawal Syndrome, may become evident only after a product is in use by the general population.
Klonopin Side Effect Report#9920846
This Death side effect was reported by a consumer or non-health professional from US. A 54-year-old male patient (weight:NA) experienced the following symptoms/conditions: muscle spasms.The patient was prescribed Klonopin (drug dosage: NA), which was initiated on
Nov 10, 2010. Concurrently used drugs: NA..After starting to take Klonopin the consumer reported adverse symptoms, such as: These side effects may potentially be related to Klonopin.
Klonopin Side Effect Report#9920822
This is a report of a 60-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: muscle contractions involuntary, who was treated with Klonopin (dosage: NA, start time:
Apr 30, 2009), combined with:
  • Toprol Xl
  • Riluzole
  • Tramadol (As Needed)
  • Prilosec
  • Cymbalta
  • Lithium Carbonate
and developed a serious reaction and side effect(s): after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Klonopin treatment in male patients, resulting in Death side effect.
Klonopin Side Effect Report#9920799
Gastrointestinal Disorder, Anaphylactic Shock, Movement Disorder, Hypovitaminosis, Convulsion
This report suggests a potential Klonopin Gastrointestinal Disorder side effect(s) that can have serious consequences. A female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: anxiety and used Klonopin (dosage: NA) starting 2010. After starting Klonopin the patient began experiencing various side effects, including: Gastrointestinal Disorder, Anaphylactic Shock, Movement Disorder, Hypovitaminosis, ConvulsionAdditional drugs used concurrently:
  • Xanax
  • Seroquel
  • Valium
  • Ativan
The patient was hospitalized. Although Klonopin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Gastrointestinal Disorder, may still occur.
Klonopin Side Effect Report#9916060
Withdrawal Syndrome, Impaired Work Ability, Malaise
This Withdrawal Syndrome problem was reported by a consumer or non-health professional from US. A 40-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: sleep disorder. On NS this consumer started treatment with Klonopin (dosage: NA). The following drugs were being taken at the same time: NA. When using Klonopin, the patient experienced the following unwanted symptoms/side effects: Withdrawal Syndrome, Impaired Work Ability, MalaiseThe patient was hospitalized and became disabled.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Withdrawal Syndrome, may become evident only after a product is in use by the general population.
Klonopin Side Effect Report#9885617
Hypersensitivity
This Hypersensitivity side effect was reported by a health professional from US. A 50-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Klonopin (drug dosage: NA), which was initiated on
Dec 08, 2013. Concurrently used drugs:
  • Percocet
  • Cymbalta
  • Symbicort
  • Albuterol Hfa
  • Buspar
  • Nicoderm
  • Pletal
  • Remeron
.After starting to take Klonopin the consumer reported adverse symptoms, such as: HypersensitivityThese side effects may potentially be related to Klonopin.
Klonopin Side Effect Report#9883325
Completed Suicide
This is a report of a male patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Klonopin (dosage: NA, start time: NS), combined with:
  • Morphine
and developed a serious reaction and side effect(s): Completed Suicide after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Klonopin treatment in male patients, resulting in Completed Suicide side effect.
Klonopin Side Effect Report#9844800
Irritability, Aggression, Restlessness, Anger, Hostility, Unevaluable Event
This report suggests a potential Klonopin Irritability side effect(s) that can have serious consequences. A 28-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: panic reaction,anxiety and used Klonopin (dosage: 1mg Pill Three Times Daily Taken By Mouth) starting
Jan 14, 2014. After starting Klonopin the patient began experiencing various side effects, including: Irritability, Aggression, Restlessness, Anger, Hostility, Unevaluable EventAdditional drugs used concurrently: NA. Although Klonopin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Irritability, may still occur.
Klonopin Side Effect Report#9782737
Myalgia, Panic Attack
This Myalgia problem was reported by a consumer or non-health professional from US. A 45-year-old patient (weight: NA) was diagnosed with the following symptoms/conditions: anxiety,panic reaction. On NS this consumer started treatment with Klonopin (dosage: 3 Pills Per Dya Three Times Daily). The following drugs were being taken at the same time: NA. When using Klonopin, the patient experienced the following unwanted symptoms/side effects: Myalgia, Panic AttackAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Myalgia, may become evident only after a product is in use by the general population.
Klonopin Side Effect Report#9765111
Somnambulism, Disorientation
This Somnambulism side effect was reported by a consumer or non-health professional from US. A 29-year-old male patient (weight:NA) experienced the following symptoms/conditions: anxiety,initial insomnia,psychomotor hyperactivity,depression.The patient was prescribed Klonopin (drug dosage: Once Daily Taken By Mouth), which was initiated on
Jul 15, 2013. Concurrently used drugs: NA..After starting to take Klonopin the consumer reported adverse symptoms, such as: Somnambulism, DisorientationThese side effects may potentially be related to Klonopin.
Klonopin Side Effect Report#9752201
Convulsion, Product Substitution Issue
This is a report of a 3.-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: epilepsy, who was treated with Klonopin (dosage: 1 Stabiet At Bedtime Orally, start time: 200911), combined with: NA. and developed a serious reaction and side effect(s): Convulsion, Product Substitution Issue after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Klonopin treatment in female patients, resulting in Convulsion side effect.
Klonopin Side Effect Report#9752000
Dysarthria, Gait Disturbance, Delirium, Disturbance In Attention, Urinary Tract Infection, Multiple Sclerosis Relapse, Extra Dose Administered
This report suggests a potential Klonopin Dysarthria side effect(s) that can have serious consequences. A 49-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: multiple sclerosis and used Klonopin (dosage: NA) starting
Dec 26, 2001. After starting Klonopin the patient began experiencing various side effects, including: Dysarthria, Gait Disturbance, Delirium, Disturbance In Attention, Urinary Tract Infection, Multiple Sclerosis Relapse, Extra Dose AdministeredAdditional drugs used concurrently:
  • Copaxone
The patient was hospitalized. Although Klonopin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Dysarthria, may still occur.
Klonopin Side Effect Report#9636594
Hodgkin^s Disease, Colitis, Cholecystectomy
This Hodgkin^s Disease problem was reported by a consumer or non-health professional from US. A female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On 2008 this consumer started treatment with Klonopin (dosage: NA). The following drugs were being taken at the same time:
  • Effexor Xr
  • Vitamin B12
  • Seroquel
When using Klonopin, the patient experienced the following unwanted symptoms/side effects: Hodgkin^s Disease, Colitis, CholecystectomyAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Hodgkin^s Disease, may become evident only after a product is in use by the general population.
Klonopin Side Effect Report#9536332
Multiple Sclerosis, Convulsion, Vertigo, Agitation, Nervousness, Dizziness, Balance Disorder, Tremor, Coordination Abnormal
This Multiple Sclerosis side effect was reported by a consumer or non-health professional from US. A 60-year-old female patient (weight:NA) experienced the following symptoms/conditions: panic disorder,agoraphobia.The patient was prescribed Klonopin (drug dosage: NA), which was initiated on 2008. Concurrently used drugs: NA..After starting to take Klonopin the consumer reported adverse symptoms, such as: Multiple Sclerosis, Convulsion, Vertigo, Agitation, Nervousness, Dizziness, Balance Disorder, Tremor, Coordination AbnormalThese side effects may potentially be related to Klonopin.
Klonopin Side Effect Report#9511237
Memory Impairment, Balance Disorder, Fall
This is a report of a 65-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: panic attack, who was treated with Klonopin Actavis Rph (dosage: 2mg 1 Pill Three Times A Day By Mouth, start time: NS), combined with:
  • Ambien
  • Cymbalta
  • Neurontin
  • Fish Oil
  • Calcium
and developed a serious reaction and side effect(s): Memory Impairment, Balance Disorder, Fall after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Klonopin Actavis Rph treatment in male patients, resulting in Memory Impairment side effect.
Klonopin Side Effect Report#9506817
Tonic Convulsion, Convulsion
This report suggests a potential Klonopin Death side effect(s) that can have serious consequences. A female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: infantile spasms and used Klonopin (dosage: Half A Tablet) starting
Mar 19, 2012. After starting Klonopin the patient began experiencing various side effects, including: Tonic Convulsion, ConvulsionAdditional drugs used concurrently: NA. Although Klonopin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Death, may still occur.
Klonopin Side Effect Report#9504101
Laryngeal Oedema, Pharyngeal Haemorrhage
This Laryngeal Oedema problem was reported by a consumer or non-health professional from US. A female patient (weight: NA) was diagnosed with the following symptoms/conditions: neuralgia,trigeminal neuralgia. On NS this consumer started treatment with Klonopin (dosage: NA). The following drugs were being taken at the same time: NA. When using Klonopin, the patient experienced the following unwanted symptoms/side effects: Laryngeal Oedema, Pharyngeal HaemorrhageAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Laryngeal Oedema, may become evident only after a product is in use by the general population.
Klonopin Side Effect Report#9493392
Dementia, Somnolence, Balance Disorder
This Dementia side effect was reported by a consumer or non-health professional from US. A 68-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Klonopin (drug dosage: 1 Tab By Mouth Twice Daily), which was initiated on
Aug 22, 2013. Concurrently used drugs: NA..After starting to take Klonopin the consumer reported adverse symptoms, such as: Dementia, Somnolence, Balance DisorderThese side effects may potentially be related to Klonopin.
Klonopin Side Effect Report#9459439
Syncope, Presyncope
This is a report of a 71-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: pain, who was treated with Klonopin (dosage: NA, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Syncope, Presyncope after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Klonopin treatment in male patients, resulting in Syncope side effect.
Klonopin Side Effect Report#9442439
Hallucination, Auditory
This report suggests a potential Klonopin Hallucination, Auditory side effect(s) that can have serious consequences. A male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: substance use and used Klonopin (dosage: NA) starting NS. After starting Klonopin the patient began experiencing various side effects, including: Hallucination, AuditoryAdditional drugs used concurrently:
  • Morphine Sulfate
  • Imitrex
  • Amlodipine Besolate
  • Cholescalcifegal
  • Glarixomone Hcl
  • Bronetalog Ginger
  • Methapham
  • Comstanison Saline Nasal Spray
Although Klonopin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Hallucination, Auditory, may still occur.
Klonopin Side Effect Report#9415273
Dizziness, Tinnitus, Vision Blurred, Abdominal Pain, Diarrhoea, Dyspepsia, Chest Pain, Myalgia, Arthralgia
This Dizziness problem was reported by a consumer or non-health professional from US. A 77-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Klonopin (dosage: NA). The following drugs were being taken at the same time:
  • Gabapentin
  • Gabapentin
  • Restasis
  • Desyrel
  • Ditropan
  • Prilosec
  • Synthroid
  • Ambien
When using Klonopin, the patient experienced the following unwanted symptoms/side effects: Dizziness, Tinnitus, Vision Blurred, Abdominal Pain, Diarrhoea, Dyspepsia, Chest Pain, Myalgia, ArthralgiaThe patient was hospitalized.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Dizziness, may become evident only after a product is in use by the general population.
Klonopin Side Effect Report#9406483
Multiple Sclerosis Relapse, Convulsion, Psychogenic Seizure, Cardio-respiratory Arrest, Fatigue, Eye Pain, Feeling Hot, Palpitations, Asthenia
This Multiple Sclerosis Relapse side effect was reported by a consumer or non-health professional from US. A 33-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Klonopin (drug dosage: NA), which was initiated on
Oct 19, 2007. Concurrently used drugs:
  • Copaxone
  • Solu-medrol
.After starting to take Klonopin the consumer reported adverse symptoms, such as: Multiple Sclerosis Relapse, Convulsion, Psychogenic Seizure, Cardio-respiratory Arrest, Fatigue, Eye Pain, Feeling Hot, Palpitations, AstheniaThese side effects may potentially be related to Klonopin. The patient was hospitalized.
Klonopin Side Effect Report#9397015
Convulsion, Anxiety, Placental Disorder, Somnolence, Exposure During Pregnancy
This is a report of a 25-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Klonopin (dosage: NA, start time: NS), combined with:
  • Depakote
  • Keppra Xr
  • Elavil (united States)
  • Topamax
  • Seroquel
and developed a serious reaction and side effect(s): Convulsion, Anxiety, Placental Disorder, Somnolence, Exposure During Pregnancy after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Klonopin treatment in female patients, resulting in Convulsion side effect. The patient was hospitalized.


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The appearance of Klonopin on this list does not mean that FDA has concluded that the drug has the listed risk. It means that FDA has identified a potential safety issue, but it does not mean that FDA has found a causal relationship between the drug and the listed risk.

What are common Klonopin Side Effects for Women?

Women Side EffectsReports
Anxiety 54
Depression 53
Dizziness 43
Convulsion 40
Pain 38
Insomnia 37
Nausea 36
Fatigue 30
Headache 28
Diarrhoea 27

What are common Klonopin Side Effects for Men?

Men Side EffectsReports
Anxiety 31
Convulsion 26
Depression 20
Insomnia 18
Feeling Abnormal 17
Nausea 15
Confusional State 14
Dizziness 13
Headache 13
Completed Suicide 12

Track Your Side Effects

Note Your Observations

It is really important to keep track of your health symptoms, right from the time you start a new medicine. You can do it any way you prefer: in a notebook, in a computer file or using our online tool. You should also note down any other medicines you are taking at the same time, because there could be an interaction between these medicines.

Why Your Notes are Important

Your notes could be helpful in several ways:

  • You can use them to remind you of details that may alert your health care professional(s) to a problem
  • You will have a record to refer to in the future, in case you are ever prescribed the same medicine again

  • Log Form

    You can use the following log form to write down important information, like the date and time you experienced a side effect and your symptoms, how strong the symptoms were, and any other medicines you were using.

    Medicine Name and Dosage:
    Side Effects Scale Date & Time Other Medicine(s) or Treatment(s)
    Scale: 1 = very mild to 10 = very bad

    Side effects reports are analyzed to discover potential health product safety signals. Some important reactions may take an extremely long time to develop or occur infrequently. Continued monitoring of adverse reactions is thus essential to maintain a comprehensive safety and effectiveness profile of health products.

    You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

    Klonopin reports list potential signals of serious risks and new safety information that were identified using the FDA Adverse Event Reporting System (FAERS).
    FAERS is a database that contains information on adverse event and medication errors reports submitted to FDA by healthcare professionals (such as physicians, pharmacists, nurses and others), consumers (such as patients, family members, layers and others) and manufacturers.

    Discuss Klonopin Side Effects

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    How Effective is Klonopin for You?

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    Klonopin Safety Alerts, Active Ingredients, Usage Information

    NDC0004-0058
    TypeHUMAN PRESCRIPTION DRUG
    Proprietary NameKlonopin
    NameClonazepam
    Dosage FormTABLET
    RouteORAL
    On market since19750602
    LabelerGenentech, Inc.
    Active Ingredient(s)CLONAZEPAM
    Strength(s)1
    Unit(s)mg/1
    Pharma ClassBenzodiazepine [EPC],Benzodiazepines [Chemical/Ingredient]

    Klonopin Dosage, Warnings, Usage.

    Side Effects reported to FDA: 931

    Klonopin safety alerts: No

    Reported deaths: 72

    Reported hospitalizations: 329

    Latest Klonopin clinical trials