ACETAMINOPHEN

📋 Quick facts

Description: ACETAMINOPHEN — SKIN CONDITIONING.

All Functions: SKIN CONDITIONING

Quick Facts:

• Category: emollient

Proven Benefits At A Glance:

• Acetaminophen is a pain reliever and fever reducer with no anti-inflammatory action
• For knee osteoarthritis, topical NSAIDs outperformed acetaminophen in clinical trials
• Rare but serious allergic reactions to acetaminophen have been documented in some people
• Acetaminophen has been associated with severe skin reactions like Stevens-Johnson syndrome, though these are uncommon
• Most people tolerate acetaminophen well

⚗️ Chemical Overview

4-hydroxyacetanilide is an odorless white crystalline solid. Bitter taste. pH (saturated aqueous solution) about 6. (NTP, 1992) Paracetamol is a member of the class of phenols that is 4-aminophenol in which one of the hydrogens attached to the amino group has been replaced by an acetyl group. It has a role as a ferroptosis inducer, a geroprotector, a non-steroidal anti-inflammatory drug, a non-narcotic analgesic, an antipyretic, a xenobiotic, a cyclooxygenase 2 inhibitor, a cyclooxygenase 1 inhibitor, a hepatotoxic agent, a cyclooxygenase 3 inhibitor, an environmental contaminant and a human blood serum metabolite. It is a member of acetamides and a member of phenols. It is functionally related to a 4-aminophenol. Acetaminophen (paracetamol), also commonly known as Tylenol, is the most commonly taken analgesic worldwide and is recommended as first-line therapy in pain conditions by the World Health Organization (WHO). It is also used for its antipyretic effects, helping to reduce fever. This drug was initially approved by the U.S. FDA in 1951 and is available in a variety of forms including syrup form, regular tablets, effervescent tablets, injection, suppository, and other forms. Acetaminophen is often found combined with other drugs in more than 600 over the counter (OTC) allergy medications, cold medications, sleep medications, pain relievers, and other products. Confusion about dosing of this drug may be caused by the availability of different formulas, strengths, and dosage instructions for children of different ages. Due to the possibility of fatal overdose and liver failure associated with the incorrect use of acetaminophen, it is important to follow current and available national and manufacturer dosing guidelines while this drug is taken or prescribed. On September 22, 2025, the US FDA initiated a labeling change for acetaminophen products suggesting that the use of acetaminophen by pregnant women may be associated with an increased risk of neurological conditions such as autism and ADHD in children. While the FDA updated labeling to caution about potential risks, large studies, national and international health authorities, and professional organizations – including the Society of Obstetricians and Gynaecologists of Canada (SOGC) and the American College of Obstetricians and Gynecologists (ACOG)- maintain that acetaminophen use in pregnancy remains a first-line therapeutic option when used at the lowest effective dose for the shortest required duration.

Source(s): CAMEO Chemicals, ChEBI, DrugBank, via PubChem

📊 Comedogenicity

🛡️ Safety rating

Safety tier is a starting heuristic from regulatory status and comedogenic rating, not a dermatological verdict — see our Terms for the full disclaimer. Research confidence reflects how many real cited studies back this ingredient, not the strength of their findings.

🌍 Regulatory Status

💧 Skin Type Compatibility

⚠️ Don’t Combine With

📚 Research & Evidence

🔬 The Science

Acetaminophen (also called paracetamol) is widely used as a pain reliever and fever reducer. Unlike NSAIDs, it does not reduce inflammation (Cureus, 2023; Best Pract Res Clin Rheumatol, 2006). For people with knee osteoarthritis specifically, research comparing acetaminophen head-to-head with other pain treatments found that topical NSAIDs were more effective at improving function than acetaminophen (Osteoarthritis Cartilage, 2021). Safety considerations: #1: In a large real-world study tracking osteoarthritis patients over one year, those using acetaminophen had higher risks of all-cause mortality, cardiovascular disease, and gastrointestinal bleeding compared to those using topical NSAIDs (Osteoarthritis Cartilage, 2021). #2: While acetaminophen is generally well tolerated, rare IgE-mediated allergic reactions (a type of immune reaction) have been documented in patients who showed anaphylactic responses to the drug; these same patients tolerated aspirin and other NSAIDs without issue (Ann Allergy Asthma Immunol, 2000).

#3: A lesser-known but serious potential adverse effect is an association with Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN)—severe skin conditions involving blistering and sloughing of skin layers. These appear to be immune-mediated reactions, and certain genetic variations in HLA genes may increase individual susceptibility, though the exact mechanisms are not fully understood (Cureus, 2023). The source notes these are rare and emphasizes that while acetaminophen is widely tolerated by most people, severe reactions do occur. In summary, while acetaminophen remains commonly recommended as a first-line pain treatment, the available evidence suggests it may be less effective than topical NSAIDs for osteoarthritis, and serious adverse effects—though uncommon—warrant awareness.

📄 Related Research

Matched by search — not necessarily verified support for every statement above.

• Zeng C et al. (2021). Comparative efficacy and safety of acetaminophen, topical and oral non-steroidal anti-inflammatory drugs for knee osteoarthritis: evidence from a network meta-analysis of randomized controlled trials and real-world data. Osteoarthritis Cartilage.
• de Paramo BJ et al. (2000). Paracetamol (acetaminophen) hypersensitivity. Ann Allergy Asthma Immunol.
• Spillers NJ et al. (2023). Association of Acetaminophen With Stevens-Johnson Syndrome and Toxic Epidermal Necrolysis: Pharmacologic Considerations and Treatment Options. Cureus.
• Bannwarth B (2006). Acetaminophen or NSAIDs for the treatment of osteoarthritis. Best Pract Res Clin Rheumatol.
• Rumack BH et al. (1975). Acetaminophen poisoning and toxicity. Pediatrics.

🧴 Products Containing ACETAMINOPHEN

• Nyquil severe Honey cold & flu
• Vicks NyQuil Cold & Flu
• nyquil
• Nyquil cold and flu
• equate children’s multi symptoms cold