Risperidone 1mg Tablets

Risperidone is a selective monoaminergic antagonist with high affinity for serotonin 5-HT2A and dopamine D2 receptors. It also antagonizes alpha1-adrenergic and, to a lesser extent, H1 histaminergic and alpha2-adrenergic receptors. Antagonism at receptors other than D2 and 5-HT2A may explain some of the other therapeutic and side effects of risperidone. The clinical efficacy in schizophrenia and bipolar disorder is believed to be mediated through a combination of D2 and 5-HT2A antagonism.

Urgent Side Effects: Seek Medical Help Right Away

Although rare, some people may experience severe and potentially life-threatening side effects while taking this medication. If you notice any of the following symptoms, contact your doctor immediately or seek emergency medical attention:

Signs of an allergic reaction, such as:
+ Rash or hives
+ Itching or red, swollen, blistered, or peeling skin (with or without fever)
+ Wheezing or tightness in the chest or throat
+ Difficulty breathing, swallowing, or talking
+ Unusual hoarseness or swelling of the mouth, face, lips, tongue, or throat
Signs of high blood sugar, including:
+ Confusion or feeling sleepy
+ Unusual thirst or hunger
+ Frequent urination or flushing
+ Fast breathing or breath that smells like fruit
Severe dizziness or fainting
Changes in behavior or mood
Shakiness, difficulty moving, or stiffness
Urination problems (difficulty starting or stopping urination, or changes in urine output)
Swallowing or speech difficulties
Difficulty focusing
Seizures
Changes in vision
Shortness of breath
Drooling
Feeling extremely hot or cold
Hormonal changes, such as:
+ Enlarged breasts or nipple discharge
+ Erectile dysfunction or menstrual changes
+ Decreased sex drive or ejaculation problems
Prolonged or painful erections (lasting more than 4 hours), which can lead to permanent sexual dysfunction if not treated promptly

Neuroleptic Malignant Syndrome (NMS): A Rare but Serious Condition

NMS is a potentially life-threatening condition that requires immediate medical attention. If you experience any of the following symptoms, contact your doctor right away:

Fever
Muscle cramps or stiffness
Dizziness
Severe headache
Confusion or changes in thinking
Rapid heartbeat or irregular heartbeat
Excessive sweating

Low White Blood Cell Count: Increased Risk of Infection

Drugs like this one can cause a decrease in white blood cell count, which can increase the risk of infection. If you have a history of low white blood cell count, inform your doctor. If you experience any signs of infection, such as fever, chills, or sore throat, contact your doctor immediately.

Tardive Dyskinesia: A Rare but Serious Muscle Disorder

Tardive dyskinesia is a condition characterized by involuntary muscle movements. If you experience any of the following symptoms, contact your doctor right away:

Difficulty controlling body movements
Problems with your tongue, face, mouth, or jaw, such as:
+ Tongue sticking out
+ Puffing cheeks
+ Mouth puckering
+ Chewing movements

Other Possible Side Effects

While many people may not experience any side effects or only minor side effects, some may occur. If you experience any of the following side effects, contact your doctor if they bother you or do not go away:

Weight gain
Restlessness
Dizziness, drowsiness, tiredness, or weakness
Anxiety
Constipation, diarrhea, stomach pain, upset stomach, or vomiting
Heartburn
Dry mouth
Changes in appetite
Common cold symptoms
Headache
Sleep disturbances
Back, muscle, arm, or leg pain

Reporting Side Effects

If you have questions or concerns about side effects, contact your doctor. You can also report side effects to the FDA at 1-800-332-1088 or online at https://www.fda.gov/medwatch.

Before Taking This Medication: Important Information to Share with Your Doctor

It is essential to inform your doctor about the following:

Any allergies you have, including allergies to this medication, any of its components, or other substances, such as foods or drugs. Be sure to describe the symptoms you experienced as a result of the allergy.
Potential interactions with other medications or health conditions. This drug may interact with other prescription or over-the-counter (OTC) medications, natural products, or vitamins, which could affect its safety and efficacy.
All medications you are currently taking, including prescription and OTC drugs, natural products, and vitamins. This information will help your doctor and pharmacist assess potential interactions and ensure safe use.
Any existing health problems, as these may impact the safety and effectiveness of this medication.

To ensure your safety, do not start, stop, or change the dose of any medication without first consulting your doctor. It is crucial to verify that it is safe to take this medication with all your other medications and health conditions.

Important Warnings and Precautions

It is essential to inform all your healthcare providers, including doctors, nurses, pharmacists, and dentists, that you are taking this medication.

Caution with Daily Activities
Until you know how this medication affects you, avoid driving and other activities that require alertness. To minimize the risk of dizziness or fainting, rise slowly from a sitting or lying down position, and be cautious when climbing stairs.

Potential Side Effects and Risks
It may take several weeks to experience the full effects of this medication. Be aware that drugs like this one have been associated with increased risks of high blood sugar or diabetes, high cholesterol, and weight gain, which may contribute to heart and brain blood vessel disease.

Monitoring and Follow-up
Follow your doctor's instructions for checking your blood sugar levels. Additionally, have your blood work checked as directed by your doctor and discuss the results with them.

Interactions with Other Substances
Avoid consuming alcohol while taking this medication. Before using marijuana, cannabis, or prescription or over-the-counter drugs that may cause drowsiness, consult with your doctor.

Precautions in Hot Weather and Physical Activity
Be cautious in hot weather or during physical activity, and drink plenty of fluids to prevent dehydration.

Dizziness and Fall Risk
This medication may cause dizziness, drowsiness, and impaired balance, increasing the risk of falls, which can result in broken bones or other health problems.

Special Considerations for Older Adults
Older adults with dementia who take medications like this one have a higher risk of stroke, which can be fatal. This medication is not approved for treating dementia-related mental health issues. If you are 65 or older, use this medication with caution, as you may be more susceptible to side effects.

Pregnancy and Fertility
This medication may affect fertility, but this effect is reversible when the medication is stopped. If you have concerns, discuss them with your doctor. Inform your doctor if you are pregnant, plan to become pregnant, or are breastfeeding, as you will need to weigh the benefits and risks to you and your baby. Taking this medication during the third trimester of pregnancy may cause side effects or withdrawal symptoms in the newborn.

• Not available

• Strong CYP2D6 inhibitors (e.g., fluoxetine, paroxetine) - may increase risperidone levels, requiring dose reduction.
• Strong CYP3A4 inducers (e.g., carbamazepine, rifampin, phenytoin) - may decrease risperidone levels, requiring dose increase.
• Drugs that prolong QT interval (e.g., Class IA and III antiarrhythmics, moxifloxacin, thioridazine) - increased risk of arrhythmias.
• CNS depressants (e.g., alcohol, benzodiazepines, opioids) - additive sedative effects.

• Antihypertensives - additive hypotensive effects.
• Dopamine agonists (e.g., levodopa) - risperidone may antagonize effects.
• Drugs causing orthostatic hypotension - increased risk of falls.
• Drugs that increase prolactin (e.g., metoclopramide) - additive hyperprolactinemia.

• Not available

• Extrapyramidal symptoms (EPS) including akathisia, dystonia, parkinsonism, tardive dyskinesia
• Neuroleptic Malignant Syndrome (NMS) symptoms (fever, muscle rigidity, altered mental status, autonomic instability)
• Orthostatic hypotension (dizziness, lightheadedness upon standing)
• Sedation/somnolence
• Weight gain
• Symptoms of hyperglycemia (polyuria, polydipsia, polyphagia)
• Symptoms of hyperprolactinemia (galactorrhea, amenorrhea, gynecomastia, sexual dysfunction)
• Changes in mental status or behavior
• Seizures
• QT prolongation symptoms (palpitations, syncope)

Use during pregnancy should only be considered if the potential benefit outweighs the potential risk to the fetus. Neonates exposed to antipsychotic drugs during the third trimester of pregnancy are at risk for extrapyramidal and/or withdrawal symptoms following delivery.

Risperidone and its active metabolite are excreted in human milk. Breastfeeding is generally not recommended due to potential for adverse effects in the infant, but individual risk-benefit should be assessed.

Approved for schizophrenia (13-17 years), bipolar mania (10-17 years), and irritability associated with autistic disorder (5-16 years). Monitor closely for weight gain, metabolic changes, and extrapyramidal symptoms. Long-term effects on growth and development are not fully established.

Elderly patients are at increased risk for orthostatic hypotension, sedation, and extrapyramidal symptoms. Black Box Warning for increased mortality in elderly patients with dementia-related psychosis. Use with caution and lower initial doses.

• Risperidone is available in various formulations including oral tablets, orally disintegrating tablets, oral solution, and long-acting injectable (LAI) formulations (Risperdal Consta, Perseris), offering flexibility in administration and adherence.
• The active metabolite, 9-hydroxyrisperidone (paliperidone), is also a commercially available antipsychotic, contributing significantly to risperidone's therapeutic effects and duration of action.
• Titrate dose slowly to minimize side effects, especially orthostatic hypotension and sedation.
• Monitor for hyperprolactinemia, which can lead to sexual dysfunction, amenorrhea, galactorrhea, and gynecomastia. Consider dose reduction or switching to another antipsychotic if problematic.
• Metabolic monitoring (weight, glucose, lipids) is crucial due to the risk of weight gain, hyperglycemia, and dyslipidemia.
• Be vigilant for extrapyramidal symptoms (EPS) and tardive dyskinesia (TD). Use AIMS scale regularly.
• Avoid abrupt discontinuation, as this can lead to withdrawal symptoms or symptom relapse.

• Other atypical antipsychotics (e.g., Olanzapine, Quetiapine, Aripiprazole, Ziprasidone, Lurasidone, Cariprazine, Brexpiprazole)
• First-generation antipsychotics (e.g., Haloperidol, Chlorpromazine) - generally less preferred due to higher EPS risk.
• Mood stabilizers (e.g., Lithium, Valproate, Carbamazepine) for bipolar disorder.
• SSRIs/SNRIs for irritability/mood symptoms in autism (off-label).

If your symptoms or health issues persist or worsen, it's essential to contact your doctor for further guidance. To ensure your safety, never share your medication with others or take someone else's medication. Some medications may come with an additional patient information leaflet, so be sure to check with your pharmacist for more information. If you have any questions or concerns about your medication, don't hesitate to reach out to your doctor, nurse, pharmacist, or other healthcare provider. In the event of a suspected overdose, immediately call your local poison control center or seek medical attention. When seeking help, be prepared to provide details about the medication taken, the amount, and the time it happened.