Arpizol

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Arpizol

Medically reviewed

Rosario Oropesa

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Arpizol

Property Description
Active ingredient Aripiprazole (INN)
Form Oral Tablet (most common)
Pharmacological class Atypical Antipsychotic Agent (Third-Generation)
Origin Synthetic compound
Drug Type Prescription-only medicine (POM)

Defining Arpizol: Identity and Active Ingredient

Arpizol is a pharmaceutical preparation whose sole active ingredient is the International Nonproprietary Name (INN) substance, Aripiprazole, which is classified as a prescription-only medicine. This compound is a synthetic substance not naturally derived, and it is typically supplied for oral administration in the form of an oral tablet. As a single-ingredient product, its pharmacological effects rely exclusively on Aripiprazole, a molecule with the formula C23H27Cl2N3O2.


What Pharmacological Class Does Arpizol Belong To?

Arpizol belongs to the therapeutic group of Atypical Antipsychotic Agents, positioning it within the broad category of psychotropic drugs. It is specifically classified as a Third-Generation Antipsychotic. This modern classification emphasizes its mechanism as a Dopamine-serotonin activity modulator (DSM). The unique dual mechanism of Aripiprazole supports its designation as a dopamine system stabilizer.


What is the General Purpose of This Type of Medicine?

The general purpose of this medicine is to help balance key chemical signals within the central nervous system, particularly those involving the dopamine D2 and serotonin 5-HT receptor systems. This is achieved through Aripiprazole’s action as a partial agonist at specific receptors, which allows the compound to stabilize neurochemical fluctuations. By promoting this regulated normalization of neurotransmission, the medicine’s overarching function is to assist in stabilizing disorganized brain activity, thereby supporting balance in a user's emotional processes and perception.

Regulatory References

  1. Aripiprazole EPAR Summary (EMA)
  2. Aripiprazole (MedlinePlus/NIH)

What side effects are possible with Arpizol?

Possible side effects and safety information

The safety profile of Arpizol (Aripiprazole) is officially documented through regulatory classifications that organize potential adverse reactions by frequency and affected organ system. This information, detailed in documents like the FDA Prescribing Information and the EMA Summary of Product Characteristics, is strictly descriptive and non-advisory.

Adverse reactions are classified into categories such as Very Common and Common. Very Common reactions (ge 1/10) typically include conditions affecting the central nervous system, such as Insomnia, Headache, and Akathisia (restlessness). Common reactions (ge 1/100 to < 1/10) extend to Gastrointestinal Disorders (e.g., Nausea, Constipation) and further Nervous System Disorders (e.g., Somnolence, Dizziness).

Serious Adverse Reactions are highlighted in regulatory warnings, including the risk of Tardive Dyskinesia (TD), a potentially irreversible movement disorder, and Neuroleptic Malignant Syndrome (NMS), a rare but life-threatening condition. Specific population safety constraints are noted, such as the FDA's Boxed Warning regarding the increased risk of Mortality and Cerebrovascular Events in elderly patients with dementia-related psychosis, an unapproved use.

Time-related patterns are also documented; for instance, Orthostatic Hypotension (low blood pressure upon standing) is officially stated as being more common at the start of treatment. Additionally, the label contains precautions regarding the potential for pathological compulsive behaviors, such as gambling or increased sexual urges, and risks associated with the body’s ability to regulate temperature.

Overdose and Emergency Response

Overdose and when to seek help

Officially documented overdose presentations of Arpizol (Aripiprazole) are focused on the potential for severe central nervous system (CNS) and cardiovascular toxicity. Manifestations range from lethargy, somnolence, and confusion to life-threatening conditions such as coma, convulsions, status epilepticus, and respiratory arrest. Cardiovascular complications are also documented in regulatory sources, including tachycardia, changes in blood pressure, and potential for serious heart rhythm abnormalities such as QT interval prolongation and atrial fibrillation. In pediatric cases of acute overdosage, the presence of profound lethargy has been specifically noted.


The regulatory documentation mandates that any suspected or confirmed overdose requires immediate medical attention. Urgent medical care is necessary due to the documented potential for severe CNS, respiratory, and cardiac complications. Management focuses strictly on supportive and symptomatic treatment, as regulatory constraints state that no specific antidote is known for aripiprazole overdose. Required medical procedures include continuous cardiac monitoring until recovery and consideration of measures such as administering activated charcoal to reduce drug absorption. Contacting emergency medical services or a Poison Control Center is required when overdose is suspected.

Therapeutic Uses of Arpizol

What Arpizol Treats: Main Uses and Benefits

The primary role of Arpizol (Aripiprazole) is providing symptomatic relief across major psychiatric and developmental disorders, helping to manage symptom clusters that create noticeable physiological strain. The medication is commonly used across conditions presenting with acute or disruptive symptom patterns.


Arpizol is applied in contexts where supportive symptom management is appropriate, including symptom management in Schizophrenia and the acute and mixed episodes of Bipolar I Disorder. It is commonly used to help with easing symptoms like irritability and aggression associated with Autism Spectrum Disorder, and for managing the involuntary motor and vocal tics seen in Tourette Syndrome. Furthermore, it is used when supportive symptom management is appropriate for adults with Major Depressive Disorder.

“It is commonly used across domains where additional symptomatic support is needed in specific patient groups.”

The benefit is that the medication provides supportive relief when symptoms interfere with routine activities. It supports patients during episodes of heightened discomfort.


Quick Fact: Relief for Psychotic Symptoms and Extreme Mood Instability

Eligibility and Restrictions for Use

The regulatory profile for Arpizol (Aripiprazole) strictly defines eligible populations and establishes absolute exclusions. Use is contraindicated in patients with a known hypersensitivity to the drug and in all elderly patients with dementia-related psychosis, as this population has a documented increased risk of death.

Eligibility for pediatric and adolescent patients is age- and indication-dependent. The minimum approved age ranges from 6 years (for Autistic Disorder and Tourette’s Disorder) to 10 or 13 years (for Bipolar I Disorder and Schizophrenia, respectively). Use is not established for children under 6 years.

Conditional use is required in several populations. Patients with severe hepatic impairment or those identified as CYP2D6 poor metabolizers require special management, although no adjustment is required for renal impairment. The label advises caution for patients with a history of cardiovascular disease, cerebrovascular disease, or seizure disorders.

Furthermore, use during the third trimester of pregnancy is restricted due to the risk of neonatal symptoms, and regulatory guidance recommends discontinuing the drug or discontinuing breastfeeding.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Arpizol (aripiprazole) is metabolized by the liver enzymes Cytochrome P450 (CYP) 2D6 and CYP3A4. Interactions with other medicines are primarily based on effects on these enzyme pathways, which can alter the concentration of aripiprazole in the body.

Dosage-Adjusted Interactions

Co-administration with strong CYP3A4 inhibitors (such as ketoconazole) or strong CYP2D6 inhibitors (such as quinidine, fluoxetine, or paroxetine) will increase Arpizol levels. When combining these medicines, the Arpizol dose must be reduced by half. Conversely, strong CYP3A4 inducers (such as carbamazepine) decrease Arpizol concentrations, requiring the Arpizol dose to be doubled.

Concomitant Medicine Category Example Drugs Required Oral Arpizol Dose Adjustment
Strong CYP2D6 or CYP3A4 Inhibitor Quinidine, Ketoconazole Reduce to half the usual dose
Strong CYP3A4 Inducer Carbamazepine Double the usual dose

Other Significant Interactions

Arpizol should be used with caution when taken with other agents that lower the seizure threshold. Additionally, due to its properties, Arpizol may enhance the effects of certain antihypertensive agents, potentially leading to additive drops in blood pressure. The additive effects of alcohol or other centrally acting drugs on the central nervous system must also be considered.

Mechanism of Action

Arpizol (aripiprazole) is an atypical antipsychotic that works by engaging several receptor-mediated signaling domains to achieve neurotransmitter system stabilization. This multi-receptor engagement results in its characteristic pattern of receptor activity and pathway modulation.


Dopamine System Modulation

Arpizol acts as a partial agonist at dopamine D2 and D3 receptors, meaning it activates these receptors but to a lesser extent than the body's natural dopamine. The partial agonism results in reduced dopaminergic signaling in states of high pathway activity and increased signaling in states of low pathway activity. This action alters the set point of dopaminergic activity, influencing the overall signal transduction within targeted neural pathways.


Serotonin Pathway Engagement

The drug also modulates key pathways associated with serotonin ( 5-HT) signaling. Specifically, it functions as a partial agonist at the 5-HT1 A receptor and an antagonist at the 5-HT2 A receptor. This dual action on serotonin receptors initiates signaling sequences that lead to downstream effects, influencing the relative activation and deactivation rates of serotonin-associated receptors.

Dosage and Administration Information

Arpizol (Aripiprazole) is administered via two principal routes: orally, using tablets, orally disintegrating tablets (ODT), or solution; and by deep intramuscular injection.

The oral dose is typically administered once daily, and the administration is standardized to be without regard to meals. For adult usage, starting doses usually range from 10 mg to 15 mg per day, with the maximum labeled dose not exceeding 30 mg daily. When initiating oral treatment, dose adjustments, if required, should generally not occur sooner than two weeks to allow the drug to reach stable concentrations.

The intramuscular route includes an immediate-release injection for acute administration, and extended-release IM suspensions for long-term maintenance, which are administered once monthly or once every two months. When starting the long-acting injectable form, a 14-day overlap with concurrent oral aripiprazole is required to bridge the time needed for the injectable form to become fully effective. Specific dose modifications are required based on the patient's metabolic profile, mandating that the oral dose be reduced to half of the usual dose for individuals identified as CYP2D6 poor metabolizers.

Recent Clinical Evidence

Research evidence / Overview of studies for Arpizol


Evidence for use in Schizophrenia

The research base for this condition involves structured, short-term Randomized Controlled Trials (RCTs) in adults. These initial studies was evaluated in research exploring how symptoms change over time, using standardized assessment scales. Longer-term studies, including randomized withdrawal trials, were also conducted. Studies were evaluated in populations including both adults experiencing acute episodes and stabilized patients, and some research has also examined adolescents aged 13 to 17 years. Research highlights changes measured during the study period in the observed populations during the acute phase. Longer-term research describes patterns related to the time elapsed before a subsequent major exacerbation occurred in stabilized patients.


Evidence for use in Bipolar I Disorder

This area outlines the evidence structure for treating acute episodes where symptoms may vary in intensity. Research has been conducted using short-term RCTs, both where Arpizol was used alone (monotherapy) and when it was added to a mood stabilizer (adjunct therapy). These studies monitored outcomes capturing phases of heightened symptom activity, such as the severity of manic or mixed episodes. Trials included both adults and pediatric patients. The short-term findings describe patterns observed in the studies regarding outcomes describing episodic or acute changes in the observed populations. It is noted that the evidence focus for this condition is primarily on the control of symptoms related to mania and mixed episodes.


What is still uncertain about Arpizol research

Evidence highlights what is known — and what is still uncertain; data are still emerging in several areas. Comparative evidence is lacking between Arpizol and some other available treatments, as many trials focused on comparison with placebo or established comparators. Subgroup findings are uncertain, meaning the research results apply most clearly to the specific populations studied (e.g., adults with acute symptoms) and not necessarily to all patients in all circumstances. Limited information is available for long-term outcomes related to functional recovery and quality of life across the full spectrum of conditions.

Key Studies & References

  1. Safety and efficacy of aripiprazole for the treatment of pediatric Tourette syndrome and other chronic tic disorders (Systematic Literature Review)

Frequently Asked Questions (FAQ)

Common questions about Arpizol (FAQ)


Q: Is Arpizol known to cause noticeable changes in mood or personality?

A: Official drug labels state that changes related to mood and behavior have been observed with this medication. This includes the emergence of pathological compulsive behaviors, such as increased sexual urges or problem gambling, which are generally monitored as part of the safety profile. Official documents also note the risk of suicidal thoughts and behaviors in certain age groups.

Q: Does Arpizol have any specific warnings regarding driving or operating machinery?

A: Official warnings advise that this medication may impair a person's judgment, thinking, or motor skills. This is due to potential side effects like dizziness and sleepiness that are sometimes reported with its use. Because of this potential for impairment, official labels describe the need for caution when performing tasks requiring mental alertness, such as driving or operating heavy machinery, until the effects of the medication are known.

Q: Is Arpizol associated with any known effects on weight?

A: Official product information indicates that changes in weight have been observed with the use of this medication. Specifically, weight gain is a known effect documented in clinical studies. For this reason, monitoring a person's weight is often part of the necessary clinical management for this medication.

Q: What if someone misses a scheduled time for Arpizol?

A: Standard patient guidance for the oral tablet suggests taking the missed dose as soon as it is remembered. However, if it is almost time for the next scheduled dose, official guidance suggests skipping the dose to prevent doubling the amount taken. If a person misses multiple doses, official information indicates that a healthcare professional should be consulted.

Q: Can Arpizol cause temporary confusion or memory issues?

A: Official safety information does not list temporary memory loss as a common side effect. Regulatory information indicates the drug has the potential to affect thinking and motor skills. Confusion is also listed as a serious, though rare, symptom associated with a severe adverse reaction known as Neuroleptic Malignant Syndrome (NMS).

Q: What happens if someone accidentally uses too much Arpizol?

A: Using too much of the medication can lead to serious effects, as noted in the regulatory documents on overdosage. Reported symptoms may include extreme sleepiness, a fast heart rate, or involuntary movements like muscle spasms. If an accidental overdose occurs, immediate emergency medical attention is advised.

Q: What is the standard guidance about stopping the use of Arpizol?

A: According to official guidance, a person should not stop taking this medication suddenly or abruptly. Even if a person begins to feel better, treatment discontinuation or alteration requires the supervision of a healthcare provider.

Q: Do any official documents describe Arpizol as potentially affecting blood sugar levels?

A: Yes, the official drug label mentions that the medication is associated with metabolic changes. This includes the potential for high blood sugar, or hyperglycemia, and a documented risk of developing diabetes mellitus. For patients with or at risk for diabetes, monitoring of glucose levels is a standard precaution.

Q: What steps are officially advised if someone experiences a severe reaction to Arpizol?

A: Official patient counseling information advises immediate medical attention if serious signs or symptoms appear. This includes signs of rare but severe conditions like Neuroleptic Malignant Syndrome (NMS) or uncontrolled body movements (Tardive Dyskinesia). In such cases, discontinuation of the drug is generally required and is performed under medical guidance.

Q: Is it necessary to have routine laboratory tests while using Arpizol?

A: Official product labels indicate that routine laboratory monitoring may be necessary for some patients. These tests can include monitoring blood sugar (glucose), checking weight and lipid levels, and in certain cases, monitoring the white blood cell (WBC) count. These checks are part of monitoring for potential metabolic changes and other documented safety risks.

Q: Does the time of day matter when a person uses Arpizol?

A: The official directions for the oral tablet state that it is generally taken once a day. While the label specifies that it can be taken with or without food, it does not mandate a specific time of day, such as morning or evening. The instructions focus on maintaining a regular, once-daily schedule.

Q: Are there any warnings about sunlight exposure while using Arpizol?

A: Regulatory information lists photosensitivity (increased sensitivity to the sun) as a possible adverse reaction. Furthermore, official warnings advise caution regarding the body's ability to regulate temperature. Patients are generally informed about the importance of avoiding excessive heat or dehydration, which includes being mindful of prolonged sun exposure.

Q: Is there a link between Arpizol and changes in appetite?

A: Official patient information notes that changes in appetite are possible side effects of the medication. Studies, particularly in pediatric patients, have documented both reports of increased appetite and decreased appetite. This potential side effect is part of the general safety information provided by regulators.

Q: Does Arpizol cause any dependency issues?

A: The drug is not characterized by regulatory documents as causing physical dependence or addiction in the same way as controlled substances. However, treatment discontinuation should be gradual, as stopping abruptly may be associated with uncomfortable effects or a return of symptoms, as noted in official guidance.

Q: Are there documented interaction risks with common herbal remedies?

A: The drug is metabolized by liver enzymes, specifically the CYP450 system, and its levels can be significantly affected by other substances. Official documents mention that some common herbal remedies, such as St. John’s Wort, are strong enzyme inducers. Using these may potentially decrease the level of Arpizol in the body, which could impact its intended effect.

Q: Do regulatory warnings mention any risks related to heart rhythm when using Arpizol?

A: Regulatory documents advise caution for patients with a history of cardiovascular disease, which is a common focus for this class of medicine. The official product information mentions that a change in heart rhythm called QT prolongation was observed in clinical trials, but the incidence was comparable to that observed with placebo.

How should Arpizol be stored and disposed of?

How to Store and Dispose of Arpizol

Official regulatory guidelines define specific conditions for storing and disposing of Arpizol (Aripiprazole) to ensure product stability and safety.

Storage Requirements

Aripiprazole tablets must be stored at controlled room temperature, typically 20 C to 25 C (68 F to 77 F), with protection from moisture. The product must be kept in the original container and stored out of the sight and reach of children.

Product Form Stability Constraint
Oral Solution Must be used within 6 months after the first opening.

Disposal Instructions

Unused or expired Aripiprazole must be disposed of in accordance with local requirements for pharmaceutical waste. The medication should not be thrown away into wastewater or household waste to comply with environmental protection rules.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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