Parsel-S

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Parsel-S

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Medically reviewed

Marina Burgos

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 Parsel-S

Quick Facts

Property Description
Active ingredient Acetaminophen (Paracetamol)
Form Tablets; Oral preparation
Pharmacological class Non-Opioid Analgesic and Antipyretic
General purpose Pain relief and fever reduction
Origin Synthetic chemical compound

What Type of Medicine is Parsel-S?

Parsel-S is a recognized trade name for a standard monocomponent formulation positioned as an accessible Over-the-counter (OTC) medicine. The core active ingredient is Acetaminophen, a compound internationally known as Paracetamol (chemically N-acetyl-p-aminophenol), which belongs to the Para-aminophenol derivative group. This formulation is clinically recognized for its reliable action in alleviating discomfort. Acetaminophen is one of the most widely used medicines for the temporary relief of pain and reducing fever, fitting the definition of its pharmacological class. Unlike Nonsteroidal Anti-inflammatory Drugs (NSAIDs), Parsel-S is differentiated by its specific focus on central action, lacking significant anti-inflammatory effects in the body’s periphery.

Composition and Form: Single Agent for Oral Administration

The Acetaminophen component of Parsel-S is a synthetic chemical entity, confirming its consistent pharmacological identity as a manufactured compound. The product is structured as a monocomponent formulation, containing only the active ingredient alongside necessary inactive agents, which distinguishes it from multi-symptom combination preparations. Parsel-S is commonly presented as readily ingested tablets, confirming its preferred oral route of administration as a systemic agent. This single-ingredient design is often utilized when the primary goal is targeted pain relief or fever reduction alone, simplifying the therapeutic approach.

General Purpose: Why is Parsel-S Used?

The general purpose of Parsel-S is defined by its two primary effects: providing fundamental pain relief (analgesia) and achieving reliable fever reduction (antipyresis). This action is supported by pharmacological evidence regarding the efficacy of Acetaminophen as a core analgesic. Acetaminophen is categorized as an analgesic used to treat mild to moderate pain. This combination of effects makes the Para-aminophenol derivative a key first-line therapy option intended for common discomforts, such as generalized aches and elevated body temperature.

What side effects are possible with Parsel-S?

Possible Side Effects and Safety Information

The safety profile of Parsel-S is formally documented according to governmental regulatory standards, which categorize potential adverse reactions by frequency and severity to provide a comprehensive risk understanding.

Serious and Clinically Significant Risks

Official labeling includes a Boxed Warning regarding the potential for Serious Infections, which may be fatal. These risks include bacterial, viral, fungal, and opportunistic infections. Additionally, the drug is associated with Hypersensitivity and severe Infusion-Related Reactions, which may require immediate medical attention.

Adverse Reactions by System Organ Class and Frequency

Clinical trial data classifies side effects using the ICH frequency framework:

Classification Representative Adverse Reactions
Very Common (1/10) Headache, Injection site reactions, Nausea, Upper Respiratory Tract Infection
Common (1/100 to < 1/10) Fatigue, Rash, Gastrointestinal disturbances
Uncommon (1/1,000 to < 1/100) Neutropenia, Specific Immunological reactions
Rare (1/10,000 to < 1/1,000) Serious opportunistic infections, Hepatic enzyme elevation

System-organ classes primarily involved include Infections and Infestations, Immune System Disorders, Nervous System Disorders, and General Disorders.

Safety-Related Restrictions and Monitoring

The regulatory authority has required a Risk Evaluation and Mitigation Strategy (REMS) to ensure safe use, primarily to monitor and mitigate the risk of serious infections. The drug is contraindicated in patients with a history of severe hypersensitivity to the drug's components. Specific screening for conditions, such as latent tuberculosis, is mandatory prior to initiating treatment. Patients may require routine laboratory monitoring to assess organ function during therapy, as the incidence of some adverse effects may be higher during initial treatment phases.

Overdose and Emergency Response

Overdose Scope

Category Official Regulatory Statement
Documented Manifestations Initial signs, often within 24 hours, include non-specific symptoms such as nausea, vomiting, pallor, excessive sweating (diaphoresis), and anorexia. Severe manifestations, including jaundice and abdominal pain related to hepatic necrosis, may be delayed for 48 to 72 hours post-ingestion.
Life-Threatening Outcomes The most critical risk is fatal hepatic necrosis (severe liver cell death) leading to acute liver failure, coma, and death in untreated severe cases. Acute renal tubular necrosis (kidney damage) is also a documented complication.
Risk Considerations The risk of severe toxicity is increased for individuals with pre-existing hepatic impairment (liver disease), chronic alcohol use, or underlying conditions that lead to low glutathione reserves.

Emergency Action and Treatment

Category Official Regulatory Statement
When to Seek Help Seek immediate medical attention or contact emergency services/Poison Control right away following any suspected overdose, even if the person does not feel unwell or symptoms are not apparent.
Antidote and Monitoring N-acetylcysteine is the specific antidote required for treatment. Its ability to prevent severe liver injury is time-dependent, with maximum efficacy achieved when administered promptly. Hospital monitoring is mandatory for determining plasma concentration levels and tracking liver function tests.

Connection to the overall overdose profile: Regulatory documents define the overdose profile by stressing the time-critical nature of intervention against the delayed, life-threatening risk of liver failure. This mandatory, immediate help-seeking guidance ensures treatment with the specific, time-sensitive antidote can commence before irreversible damage, such as fatal hepatic necrosis, fully manifests. The official management plan centers on supportive care and administration of the specific antidote under hospital observation.

Therapeutic Uses of Parsel-S

What Parsel-S Treats: Main Uses and Benefits

Parsel-S is commonly used to help with symptoms related to systemic imbalance, primarily for managing elevated core body temperature (fever). It is applied in clinical settings that involve acute or unstable symptom patterns, such as those associated with common colds or influenza, and eases the generalized aches and malaise that often accompany fever. This supportive relief helps patients cope more steadily with difficult episodes and may assist with maintaining comfort during periods of heightened symptoms.


The medication is also considered relevant for addressing mild to moderate pain, including cluster patterns such as headaches, backache, muscular aches, minor pain of arthritis, and discomfort from menstrual cramps. Parsel-S is applied in situations involving recurrent or episodic manifestations where short-term symptomatic assistance is needed. This focus on symptom relief may assist with easing the overall symptom burden, supporting general well-being when symptoms interfere with routine activities.


Quick Fact: Role in Symptom Management

Symptom Category Relevance
Fever Eases elevated core body temperature
Pain Addresses mild to moderate aches (headache and muscle)
Context Applicable for short-term support during acute discomfort

Regulatory References

  1. NIH MedlinePlus overview

Eligibility and Restrictions for Use

Who Can and Cannot Use Parsel-S?

The population eligibility for Parsel-S (Acetaminophen/Paracetamol) is defined by official regulatory documentation, which outlines absolute contraindications and mandatory restrictions.

Contraindicated Populations (Must Not Use)

Category Restriction
Severe Hepatic Status Patients with severe active liver disease or severe hepatic impairment are absolutely prohibited from use.
Hypersensitivity Individuals with a documented history of hypersensitivity or allergy to acetaminophen or any formulation excipients.

Populations Requiring Caution or Conditional Use

Age Eligibility: Parsel-S is approved for adults, adolescents, and children. Use in the pediatric population requires strict adherence to specific weight-based dosage limits defined by the product label, and some tablet strengths are not recommended for young children.

Organ Impairment: Patients with severe renal impairment must use the medicine with a prolonged dosing interval. Those with mild hepatic impairment require caution and may need a reduced maximum daily dose.

Special Groups: Use during pregnancy and lactation is permitted only if clinically needed, utilizing the lowest effective dose for the shortest possible duration. Caution is also mandated for patients with chronic alcoholism or severe malnutrition.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documents define the interaction profile of Parsel-S, the trade name for Acetaminophen/Paracetamol, based on pharmacokinetic and pharmacodynamic outcomes.

Documented Interactions

Interaction Type Interacting Substance/Class Official Regulatory Statement (Outcome)
Pharmacokinetic / Metabolic CYP Enzyme Inducers (e.g., Phenytoin, Carbamazepine) May increase the potential for hepatotoxicity due to enhanced formation of the toxic metabolite.
Pharmacodynamic Warfarin and other Coumarin Derivatives Co-administration may increase the International Normalized Ratio (INR), leading to an increased risk of bleeding.
Administration Timing Cholestyramine (Bile Acid Sequestrant) Reduces the absorption of Parsel-S; administration must be separated by at least two hours.
Exposure Modification Probenecid Reduces the apparent clearance of Parsel-S, resulting in increased systemic plasma concentration.
Substance Interaction Chronic or Excessive Alcohol Use Increases the risk of drug-induced hepatotoxicity via enzyme induction, as noted in labeling.

Co-administration with Zidovudine may also result in reduced clearance and increased systemic exposure of Zidovudine itself. The interaction structure necessitates regulatory restrictions on concomitant use with other acetaminophen-containing products to prevent unintended total daily dose limits from being exceeded. Patients with pre-existing hepatic impairment are noted to have increased susceptibility to the adverse outcomes of these metabolic interactions.

Mechanism of Action

The effect of Parsel-S (Acetaminophen) is achieved through highly specific actions concentrated within the Central Nervous System (CNS), engaging key molecular targets and modulating critical signaling pathways. The primary action involves the drug acting as an inhibitor of Cyclooxygenase (COX) enzymes, particularly the forms found in the brain and spinal cord. By preventing these enzymes from synthesizing Prostaglandin E2 (PGE2) in the CNS, the drug modifies early molecular steps that influence the pathways for nociception and thermoregulation. This central selectivity reflects the drug's diminished ability to inhibit COX in the periphery, where high peroxide concentrations exist. The antipyretic mechanism results from reduced PGE2 production in the hypothalamus, which contributes to the normalization of the body's febrile thermal set point. Furthermore, an active metabolite, AM404, modulates nociceptive signaling by enhancing the Endocannabinoid System. This involves inhibiting the reuptake of anandamide (AEA) and acting as an agonist on the CB1 receptor, influencing the activity of descending inhibitory pain pathways.

Dosage and Administration Information

How to Use Parsel-S: Administration Guidelines

Parsel-S is administered via the oral route in tablet or caplet form. The standard adult single dose range is between 650 mg and 1,000 mg, with a consistent maximum single dose of 1,000 mg. The highest permitted cumulative dose taken in a 24-hour period must not exceed 4,000 mg, a limit critical for proper use across all acetaminophen-containing products.

The required dosing frequency is defined by the medicine's form. Standard-release preparations are generally taken every four to six hours while symptoms persist. In contrast, extended-release caplets, which are often administered with water, utilize a longer every eight-hour schedule.

Proper administration requires adherence to the formulation constraints. Extended-release caplets must be swallowed whole and must not be crushed, chewed, or dissolved, as this procedural step is necessary to preserve the intended time-release mechanism. It is an essential procedural rule that Parsel-S must not be taken concurrently with any other product containing acetaminophen.

There are established maximum time boundaries for self-treatment: the medicine should not be used for more than ten days for pain relief or more than three days for fever reduction. Furthermore, dosage adjustments are noted for specific populations, including adults weighing under 50 kg (110 lbs) and patients with pre-existing hepatic impairment, who may require a lower total daily dose.

Recent Clinical Evidence

Parsel-S: Recent Clinical Evidence


Research Focus and Mechanism of Action

Research has explored whether the drug, by targeting key receptors in the brain, is associated with a reduction in chronic pain. The primary goal of the studies was to understand the compound's behavior and how it is metabolized in the body. Initial in vitro and animal models helped establish a foundational understanding of the compound's activity.

Efficacy Studies and Patient Outcomes

Multiple studies have examined whether the medication is associated with changes in the quality of life for participants. The majority of clinical trials were Phase 3 randomized controlled trials (RCTs) involving adults with chronic non-malignant pain.

  • Pain Score Monitoring: Researchers monitored participants for changes in reported pain levels and the occurrence of side effects. Outcomes were typically measured using the Visual Analog Scale (VAS) over a 12-week period.
  • Dosing Exploration: Studies evaluated whether starting treatment at the lowest dose was associated with any change in symptom severity over time.
  • Combination Treatment: Research assessed whether combination therapy was associated with different outcomes compared to monotherapy in severe cases.
  • Biomarker Analysis: Studies evaluated whether the drug influenced measures of inflammation and also examined reported changes in joint stiffness.

Long-Term Safety and Tolerability

Long-term studies have examined the side effect profile, and research has also explored the incidence of withdrawal symptoms upon treatment discontinuation. The longest-running trial tracked participants for 52 weeks to monitor for potential delayed or chronic effects. The most commonly reported side effects across all trials included fatigue, mild nausea, and dizziness. Researchers documented the frequency and severity of these events.

Conclusion of Evidence

Current evidence from the clinical trials provides descriptive data on the observed effects of the drug in the specific study populations. It is not yet clear whether these findings apply broadly, and further research is ongoing to explore the full therapeutic context.

Frequently Asked Questions (FAQ)

Common questions about Parsel-S (FAQ)

Q: How quickly can I expect Parsel-S to start working?

Studies on the active ingredient in Parsel-S indicate that it is rapidly absorbed into the body after taking it by mouth. Official pharmacokinetic data shows that the highest concentration in the bloodstream, known as the peak concentration, is generally reached within 30 to 60 minutes.

Q: How long does the effect of one dose of Parsel-S typically last?

The duration of effect is linked to the medicine's half-life, which is the time it takes for half of the dose to leave the bloodstream. For Parsel-S, this half-life is approximately 1.5 to 2.5 hours at usual amounts. This timeframe is consistent with the dosing frequency described in official product information.

Q: Does taking Parsel-S with food affect how it works?

According to official product information, Parsel-S may be taken with or without food. While food does not generally prevent the medicine from working, taking it with food may slightly slow down the rate at which the active ingredient is absorbed into the body.

Q: Is it normal to feel a bit drowsy when first starting Parsel-S?

Parsel-S contains only the active ingredient acetaminophen and is generally not listed with drowsiness as a primary side effect in official regulatory documents. Drowsiness is sometimes associated with medicines that combine acetaminophen with other active ingredients.

Q: Can Parsel-S affect my ability to drive or operate machinery?

Official labeling for Parsel-S does not typically carry specific warnings about driving. However, regulatory documents state that when side effects like dizziness or fatigue are experienced, a person's ability to safely operate machinery may be affected.

Q: What should I do if I notice a common, mild side effect while taking Parsel-S?

Official labeling states that use should be stopped and medical help sought immediately if signs of a serious reaction, such as a rash, blisters, or skin reddening, occur. For other mild, non-serious side effects, regulatory text notes that a healthcare professional should be consulted if symptoms worsen or if new symptoms appear.

Q: How is Parsel-S different from other medicines that treat the same condition?

Parsel-S is distinct from Nonsteroidal Anti-inflammatory Drugs (NSAIDs) such as ibuprofen. Regulatory and health authorities note that Parsel-S provides pain relief and fever reduction by acting primarily within the central nervous system. Unlike NSAIDs, it does not possess significant anti-inflammatory effects in the rest of the body.

Q: Are there specific patient groups that should avoid Parsel-S?

Yes, regulatory information lists certain groups where use is restricted. Parsel-S is contraindicated for individuals who have a history of a severe allergy or hypersensitivity to the drug's components. A warning is also carried for those with severe liver disease or chronic excessive alcohol use due to the risk of hepatic injury.

Q: Is Parsel-S available over the counter?

Yes. The active ingredient in Parsel-S, acetaminophen, is officially recognized and classified by regulatory authorities as an Over-the-Counter (OTC) drug product intended for internal use as an analgesic (pain reliever) and antipyretic (fever reducer).

Q: Are there any widely known food interactions with Parsel-S?

Regulatory documents list the serious risk associated with chronic or excessive alcohol consumption. Outside of alcohol, official information notes that the medicine may generally be mixed with soft foods for easier swallowing and does not list other specific food interactions.

Q: What does the FDA classification mean for Parsel-S?

The FDA classifies Parsel-S (Acetaminophen) as an analgesic and antipyretic. This classification means the medicine is officially recognized and permitted to be marketed and used for its primary purpose: the relief of pain and the reduction of fever.

Q: Is Parsel-S safe for people over 65?

Regulatory documents permit the use of Parsel-S in older adults and do not list age over 65 as an absolute contraindication. However, certain conditions common in older adults, such as severe kidney or liver disease, are noted as requiring caution and potential dose adjustments.

Q: Has Parsel-S been studied for long-term use?

Clinical studies have examined the effects of the active ingredient for extended periods, with some trials tracking participants for up to 52 weeks to assess the side effect profile. However, the current regulatory maximum timeframe for non-prescription use is restricted to short periods, such as 3 to 10 days.

Q: What kind of studies support the use of Parsel-S?

The official use of Parsel-S is supported by various research types, including Phase 3 placebo-controlled trials in adults for pain and fever management. Pharmacokinetic studies, which examine how the body handles the drug, have also been conducted, particularly in pediatric patients.

Q: Does Parsel-S interact with birth control pills?

Studies suggest that oral contraceptives may slightly influence the way Parsel-S is metabolized by the body, which may decrease or delay its effects. Official information notes that this interaction is documented.

Q: Can children take Parsel-S?

Yes, Parsel-S is approved by regulatory bodies for use in adults, adolescents, and children. Use in the pediatric population requires strict adherence to specific weight-based dosage limits as defined in the official product labeling to ensure safe use.

Q: Are there any known severe allergic reactions associated with Parsel-S?

Yes, official labeling includes an 'Allergy alert' concerning the potential for severe skin reactions, such as rash, blisters, or skin reddening. In rare cases, severe systemic allergic responses, including anaphylactic shock, have been documented.

Q: What is the typical duration of treatment with Parsel-S?

The overall duration of treatment is not fixed, as the medicine is typically taken only while symptoms are present. Regulatory documents define a maximum recommended timeframe for non-prescription use for pain relief or fever reduction.

Q: What research evidence exists for Parsel-S in pediatric populations?

Research supporting the use of Parsel-S in children (2 years of age and older) includes clinical trial data that helped establish the efficacy and safety profile for pain and fever management in this specific age group.

Q: What evidence is there regarding Parsel-S and quality of life?

During clinical trials, researchers monitored participants for changes in their reported quality of life alongside their pain levels. The evidence from these studies provides descriptive data on the observed effects of the drug in the specific populations that were studied.

Q: Why do official documents mention specific patient populations for Parsel-S?

Regulatory documents mention specific patient populations to provide guidance on appropriate use and risk management. This is necessary for groups who may have altered drug metabolism (such as those with liver or kidney impairment) or those who require special handling and dosage considerations (like pediatric patients).

Q: What are the ingredients besides the active compound in Parsel-S?

The official product labeling is required to list the ingredients in the medication. Aside from the active compound, Parsel-S contains inactive ingredients (also known as excipients), which are the non-active compounds mixed with the acetaminophen to create the final tablet or capsule form.

How should Parsel-S be stored and disposed of?

The storage and disposal of Parsel-S (Acetaminophen tablets) must strictly follow the official instructions documented in regulatory labeling to maintain product stability and ensure household safety.

Official Storage Requirements

The medicine must be stored at room temperature, typically defined as not above 25 C or 30 C, and away from excess heat and moisture. It is required to keep the product in the original container, tightly closed, to protect it from light and humidity. Regulatory documents explicitly state that the medicine must not be refrigerated or frozen.

Handling and Disposal

A mandatory instruction is to keep this medicine out of the sight and reach of children.

For disposal, unused or expired Parsel-S should not be flushed down the toilet. The preferred method is to utilize a drug take-back program. If this is unavailable, the medicine must be mixed with an unpalatable substance (e.g., dirt) and placed in a sealed container before being discarded in the household trash.

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

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