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What Is the L484 Pill? Identification, Uses & Safety

The L484 pill is one of the most commonly found and most commonly asked-about tablets in the United States. If you have found a white oblong pill stamped with "L484" and are wondering what it is, the answer is straightforward: it is acetaminophen 500 mg, the generic equivalent of Tylenol Regular Strength. This article explains what that means, how to use it safely, and the critical warnings you need to know — particularly around dosing limits and the hidden sources of acetaminophen in combination products.

Pill Identification: What L484 Looks Like

The imprint "L484" follows the standard FDA-required format: the letter "L" identifies the manufacturer — LNK International, Inc., based in Hauppauge, New York — and the number "484" identifies the specific product within their catalog. LNK International manufactures store-brand and private-label OTC medications for major retailers including Walmart (Equate), Walgreens, CVS, Rite Aid, and many others. This is why the exact same white oblong L484 tablet may appear in packaging from dozens of different store brands — the pill itself is manufactured by a single company and sold under many labels.

What Acetaminophen Is and What It Treats

Acetaminophen (also called paracetamol outside the United States) is an analgesic and antipyretic — a pain reliever and fever reducer. It has been in clinical use since the 1950s and is one of the most widely used medications in the world. Unlike ibuprofen or aspirin, acetaminophen is not a nonsteroidal anti-inflammatory drug (NSAID) and does not reduce inflammation at standard doses. Its mechanism is not fully understood, but it is believed to act on pain-signaling pathways in the central nervous system.

Acetaminophen 500 mg (the L484 tablet) is indicated for:

• Mild to moderate pain — headache, toothache, backache, menstrual cramps, minor arthritis pain
• Muscle aches and pains associated with colds or flu
• Reduction of fever
• Minor pain associated with sore throat

It is generally well tolerated, does not irritate the stomach the way NSAIDs can, and is safe for most adults when used exactly as directed. It is also one of the few pain relievers considered safe to use during pregnancy when needed (consult your healthcare provider).

Standard Adult Dosing

The FDA-approved label for acetaminophen 500 mg tablets specifies the following for adults and children 12 years and older:

• Standard dose: 2 tablets (1,000 mg) every 6 hours as needed
• Maximum single dose: 1,000 mg (2 tablets)
• Maximum daily dose: 4,000 mg (4 g) — no more than 8 tablets in 24 hours
• Minimum interval between doses: 6 hours

The Liver Damage Risk: Why the Dose Limit Matters

Acetaminophen is processed almost entirely by the liver. At normal doses, the liver handles this without difficulty. But when the total dose exceeds what the liver can safely metabolize, a toxic byproduct called NAPQI accumulates. NAPQI destroys liver cells. At high enough levels — typically above 7.5–10 grams in a single episode in an otherwise healthy adult — it can cause acute liver failure, which is life-threatening and may require a liver transplant.

Acetaminophen overdose is the leading cause of acute liver failure in the United States, responsible for approximately 56,000 emergency department visits, 2,600 hospitalizations, and 500 deaths per year, according to the FDA. The majority of these cases are unintentional — the result of people not realizing how much acetaminophen they are taking across multiple products simultaneously.

Hidden Acetaminophen: The Combination Product Problem

This is one of the most important safety issues around acetaminophen, and it is widely underappreciated. Acetaminophen is an ingredient in more than 600 different prescription and over-the-counter drug products. People who take an L484 tablet for a headache and then reach for a NyQuil for their cold symptoms may be doubling or tripling their acetaminophen dose without realizing it.

Common products that contain acetaminophen include:

• Cold and flu products: NyQuil, DayQuil, Theraflu, Robitussin (some formulas), Alka-Seltzer Plus
• Sleep aids: Tylenol PM, ZzzQuil (some formulas), Excedrin PM
• Headache combinations: Excedrin Migraine (250 mg acetaminophen per tablet)
• Prescription opioid combinations: Percocet (oxycodone + acetaminophen), Vicodin (hydrocodone + acetaminophen), Norco, Lortab, Endocet

Always read the "Drug Facts" or "Active Ingredients" label on every OTC product, and tell your prescriber and pharmacist about all medications you are taking. Many combination opioid prescriptions already contain 325 mg of acetaminophen per tablet, which adds up quickly with standard dosing schedules.

Signs of Acetaminophen Overdose

Acetaminophen overdose is particularly dangerous because the early symptoms are mild and can be dismissed. The progression occurs in stages:

• Hours 1–24: Nausea, vomiting, malaise, loss of appetite. Many people feel only mildly unwell and do not seek care during this window — but this is the critical treatment period.
• Hours 24–72: Right-side abdominal pain (liver enlargement), jaundice (yellowing of skin/eyes), dark urine, elevated liver enzymes
• Hours 72–96: Peak liver damage — liver failure, kidney failure, coagulopathy, encephalopathy in severe cases
• Days 4+: Either recovery or progression to fulminant liver failure requiring transplant

The antidote is N-acetylcysteine (NAC), which is highly effective when given early. Treatment outcomes are vastly better when medical care is sought within 8–10 hours of ingestion. Do not wait for serious symptoms to appear.

Frequently Asked Questions

What is the L484 pill?

The L484 is a white oblong tablet containing 500mg of acetaminophen — the same active ingredient as Tylenol — manufactured by LNK International. It is sold under dozens of store-brand labels at major retailers including CVS, Walgreens, Walmart, and Target. Despite its generic appearance, it is pharmaceutically equivalent to brand-name Tylenol Extra Strength.

Is the L484 the same as Tylenol Extra Strength?

Yes, in terms of active ingredient and strength. Both contain 500mg of acetaminophen per tablet, and the FDA requires that generic drugs be bioequivalent to their brand-name counterparts. The only differences are the manufacturer, the imprint code, and the price — store-brand versions are typically much less expensive.

What is the biggest safety risk with the L484 pill?

The greatest risk is accidental overdose from stacking multiple acetaminophen-containing products. Because acetaminophen appears under many different brand names and in combination products like NyQuil, Theraflu, and prescription opioid combinations, people frequently take more than they realize. Exceeding safe daily limits — especially combined with regular alcohol use — can cause serious liver damage.

Can the L484 pill be confused with other medications?

The "L" prefix on pill imprints is registered exclusively to LNK International, so L484 is unambiguously a store-brand acetaminophen tablet. However, white oblong tablets in general are very common, and identifying a pill solely by appearance without reading the imprint is unreliable. Always use the full imprint code when identifying an unfamiliar tablet.