What Is the S500 White Oval Pill?

The white oval S500 pill discussed in this guide is marked with the imprint S 500 and contains acetaminophen 500 mg, a common over-the-counter medicine used to relieve pain and reduce fever. Acetaminophen is widely available and appears as the active ingredient in many pain, fever, cold, and flu medicines.

However, the imprint alone is not enough to identify every pill. Other medications may also carry an S 500 imprint but have a different color or shape. Therefore, always check the pill’s imprint, color, shape, and size before identifying an unknown medication. This guide focuses on the white oval S500 acetaminophen 500 mg pill. If your pill looks different, ask a pharmacist to confirm its identity before taking it.

What Is the Pill Imprint?

A pill imprint is a group of letters, numbers, or symbols printed or stamped on a tablet or capsule. These markings help identify medications and separate pills that may otherwise look similar. The acetaminophen tablet covered in this guide has the imprint S 500 or S500.

Here are its main identification features:

Feature	S500 Pill Details
Imprint	S 500 / S500
Active ingredient	Acetaminophen
Strength	500 mg
Color	White to off-white
Shape	Oval on the older S;500 label; capsule-shaped on a current S500 label
Size	About 18 mm
Route	Oral
Purpose	Pain reliever and fever reducer

The tablet is film-coated and does not have a score line. Older product labeling describes an S 500 acetaminophen tablet as white and oval, while a newer S500 product describes it as white to off-white and capsule-shaped. Both identify the medicine as acetaminophen 500 mg and list a size of about 18 mm.

Still, you should not identify an unknown medication from the imprint alone. Pills with similar markings can contain different medicines, so checking the complete appearance reduces the chance of confusing one drug with another. If you are comparing white acetaminophen tablets, the L484 pill is another white oval tablet that contains acetaminophen 500 mg but uses a different imprint.

Details for Pill Imprint S 500

The white oval pill marked S 500 contains 500 mg of acetaminophen. Acetaminophen is one of the most widely used over-the-counter medicines for minor pain and fever, and it also appears in many cold, flu, headache, and combination medicines.

Outside the United States, acetaminophen is commonly known as paracetamol. You may also see the abbreviation APAP on some medication labels. These names can refer to the same active drug, so checking the active ingredient section becomes especially important when you use more than one medicine.

Pill Classification

Acetaminophen belongs to two main drug categories:

• Analgesics, which relieve pain
• Antipyretics, which reduce fever

Acetaminophen is not an NSAID. This makes it different from medicines such as ibuprofen, aspirin, and naproxen. Although all of these medicines may help relieve pain, they work differently in the body and do not have exactly the same warnings, uses, or side effects.

The S500 acetaminophen tablet is also not a narcotic or controlled substance. The product labeling lists no DEA controlled-substance schedule.

What’s Inside the S500 Pill?

The main active ingredient in the white S500 pill is acetaminophen. Each caplet contains 500 mg of this medicine, while inactive ingredients help form, coat, and preserve the tablet. The exact inactive ingredients can vary between manufacturers, so people with allergies or sensitivities should check the package of the product they actually have.

Active Ingredient (in Each Caplet)

Acetaminophen 500 mg is the active ingredient in each caplet. Many prescription and over-the-counter medicines also contain acetaminophen, which means people can accidentally take more than they realize if they combine several products.

Therefore, always check the active ingredients before combining different pain, cold, flu, or fever medicines. Taking more than one acetaminophen-containing product at the same time can increase the risk of taking too much.

Purpose

Acetaminophen 500 mg works as a:

• Pain reliever
• Fever reducer

It can temporarily reduce minor pain and help lower an elevated body temperature. However, it mainly treats symptoms rather than the underlying cause of an illness or injury.

What Is It Used For?

The S500 pill may provide temporary relief from several common minor aches and pains. Since it contains acetaminophen 500 mg, people may use it for short-term pain relief as well as fever reduction.

It can be used for:

• Headache
• Backache
• Toothache
• Muscular aches
• Minor arthritis pain
• Aches associated with the common cold
• Premenstrual cramps
• Menstrual cramps
• Fever

These uses match the current acetaminophen 500 mg product label.

Acetaminophen treats symptoms such as pain and fever. However, it does not treat the underlying cause of an infection, injury, or medical condition. For example, it may reduce discomfort from a toothache, but it will not treat the dental problem causing the pain.

Symptoms the S500 Pill May Help Relieve

People often use acetaminophen for mild to moderate pain or fever. For example, someone may take it for a headache, sore muscles, dental pain, back pain, or a fever caused by a common illness. Because these symptoms can have many causes, acetaminophen should not replace medical evaluation when a problem continues.

Ongoing or worsening symptoms may need medical attention. Speak with a doctor if pain becomes worse or continues for more than 10 days. You should also seek medical advice if fever gets worse or lasts longer than three days, new symptoms appear, or redness or swelling develops.

How Does the Pill Work?

Acetaminophen helps change how the body responds to pain and elevated temperature. Its exact mechanism is not fully understood, although its effects involve pain perception and temperature control.

Unlike ibuprofen and naproxen, acetaminophen does not belong to the NSAID drug class. This difference matters because acetaminophen should not automatically be treated as an anti-inflammatory medicine or assumed to have the same risks and benefits as an NSAID.

How Does Acetaminophen Work?

The exact way acetaminophen works is complex and is not fully understood. However, its activity affects how the body senses pain and controls elevated temperature.

In simple terms, acetaminophen helps reduce pain and fever. For everyday use, following the correct dose and avoiding too much acetaminophen is more important than understanding its full chemical mechanism.

Acetaminophen Brand Names

Acetaminophen is available as a generic medicine and under different brand names. It also appears as an ingredient in some products that combine several medicines to treat pain, cold, or flu symptoms.

Current U.S. examples include:

• Tylenol
• FeverAll

Some older or international acetaminophen brand names may still appear online, but not all of them remain marketed in the United States. Therefore, the S500 white oval pill contains the same active ingredient found in Tylenol products, but S500 itself is not the Tylenol brand name.

Always check the Active Ingredients section on a medication label before combining different medicines. A product may contain acetaminophen even when the front of the package focuses on symptoms such as headache, cold, flu, or sinus pain.

Dosage and Administration

Directions can vary between acetaminophen products, even when tablets have a similar S500 imprint. One current S500 acetaminophen 500 mg product directs adults and children age 12 and older to take two caplets every six hours while symptoms last, with no more than six caplets in 24 hours unless a doctor directs otherwise.

Therefore, always follow the Drug Facts label on the exact product you have rather than assuming every S500 tablet has the same dosing instructions. Adults and children age 12 and older should not take more than 4,000 mg of acetaminophen from all medicines combined in 24 hours, although an individual product may set a lower daily limit.

Standard Dosage

For the current capsule-shaped S500 acetaminophen product referenced for dosing here:

• Each caplet contains 500 mg acetaminophen
• Adults and children age 12+: 2 caplets every 6 hours while symptoms last
• Do not take more than 6 caplets in 24 hours unless directed by a doctor
• Do not use for more than 10 days unless a doctor tells you to
• Children under 12: ask a doctor before using this adult-strength product

These directions apply to one current S500 acetaminophen 500 mg product. Other acetaminophen products with a similar imprint may have different directions, so always check the Drug Facts label on the package you actually have.

How to Take the S500 Pill

Take the medicine exactly as directed on the package. Do not take extra tablets simply because pain or fever has not improved yet, and do not shorten the recommended time between doses unless a healthcare professional tells you to do so.

Also, check other medicines for:

• Acetaminophen
• APAP
• Paracetamol

These terms may refer to the same active drug. Taking several products that contain acetaminophen can lead to an accidental overdose, especially when someone uses pain medicine together with cold or flu products.

Why S500 dosage directions may differ: Different manufacturers and product labels can provide different directions for acetaminophen 500 mg tablets with similar S500 markings. For this reason, the label on the exact package you have should always guide dosing rather than information based only on the imprint. The older oval S;500 label, for example, listed a different daily maximum than the current capsule-shaped S500 label. Acetaminophen also comes in different strengths and release types; for example, the G650 pill covers a higher-strength extended-release acetaminophen tablet.

Potential Side Effects

Most people can use acetaminophen without serious problems when they follow the recommended dose. However, unwanted reactions can occur, and taking too much acetaminophen can cause severe liver damage.

Rare but serious allergic and skin reactions are also possible. Therefore, pay attention to unusual symptoms, especially after starting a medicine you have not used before.

Common Side Effects

Acetaminophen usually causes few problems when people take it as directed. However, side effects can occur. Contact a healthcare professional if you develop an unusual or persistent symptom after taking it. More importantly, watch for the serious skin, allergic, and liver-related symptoms described below.

Serious Side Effects

Stop taking acetaminophen and seek medical help if you develop signs of a serious allergic or skin reaction.

Possible warning signs include:

• Severe rash
• Skin redness
• Blisters
• Peeling skin
• Swelling
• Trouble breathing
• Trouble swallowing

Serious skin reactions are rare, but they can happen even in someone who previously used acetaminophen without a problem.

Possible signs of serious liver problems can include:

• Yellow skin or eyes
• Dark urine
• Upper abdominal pain
• Pale stools

These symptoms can signal a serious problem and require medical attention. In addition, suspected overdose requires urgent help even when obvious symptoms have not developed.

Warnings

The most serious safety concern with acetaminophen is liver damage caused by taking too much. People may accidentally exceed the recommended amount when they use several medicines that contain acetaminophen during the same day.

For this reason, carefully check all prescription and over-the-counter medicines you use, especially products for pain, headache, cold, flu, or fever. Keeping track of the total amount of acetaminophen you take can reduce the risk of accidental overdose.

Liver Warning

Severe liver damage may occur if a person:

• Takes more acetaminophen than recommended
• Uses several medicines containing acetaminophen together
• Drinks 3 or more alcoholic drinks every day while using acetaminophen

Do not take more than the amount listed on your medication label. Also, ask a healthcare professional before using acetaminophen if you already have liver disease.

Alcohol Warnings

Alcohol and acetaminophen can both raise concerns about liver injury. The warning becomes especially important for people who drink three or more alcoholic drinks every day while using acetaminophen.

If you regularly drink alcohol, speak with a healthcare professional before taking acetaminophen.

Overdose Warning

An acetaminophen overdose can cause severe liver injury and may become life-threatening. If someone takes more acetaminophen than recommended, get medical help immediately even if the person feels well.

Some people may have no symptoms at first. Therefore, do not wait for symptoms before getting medical help after a suspected overdose. Quick medical attention is important for both adults and children.

Early symptoms may include:

• Nausea
• Vomiting
• Loss of appetite
• Sweating
• Abdominal discomfort

However, serious liver injury may develop even when early symptoms seem mild or are not present.

Who Should Ask a Doctor Before Taking the S500 Pill?

Do not take this acetaminophen product if you are allergic to acetaminophen or any ingredient in the tablet. You should also avoid combining it with another medicine that contains acetaminophen unless a healthcare professional has specifically advised you to do so.

Some people may need additional medical guidance because of liver problems, regular alcohol use, pregnancy, breastfeeding, or medicines they already take. Checking these factors before use can help lower the risk of unwanted effects.

People with Allergies

Although serious allergic or skin reactions to acetaminophen are uncommon, they can occur. A reaction can affect the skin, face, throat, or breathing and may require urgent medical care.

Stop taking the medicine and seek medical help if you develop:

• Rash
• Blisters
• Facial or throat swelling
• Difficulty breathing
• Difficulty swallowing

If a healthcare professional confirms a serious skin reaction caused by acetaminophen, do not take acetaminophen-containing products again.

Individuals with Certain Medical Conditions

Ask a doctor before using acetaminophen if you have liver disease. Existing liver problems may affect how safely you can use the medicine.

Pregnant or breastfeeding individuals should also speak with a healthcare professional before use. In addition, people who regularly drink alcohol or take certain prescription medicines may need more specific guidance before using the S500 pill.

Interactions with Other Medications

Acetaminophen can interact with certain medicines. In addition, accidental double dosing can happen because acetaminophen appears in many combination products that people may not immediately recognize as acetaminophen medicines.

Before combining medications, check every active ingredient carefully. This is especially important when taking several over-the-counter products for different symptoms during the same day.

Common Drug Interactions

People who take warfarin, a blood-thinning medicine, should ask a doctor or pharmacist before using acetaminophen.

Another major concern is using several medicines that contain acetaminophen.

For example, some:

• Cold medicines
• Flu medicines
• Headache products
• Prescription pain medicines

may already contain acetaminophen. Taking them together with the S500 pill could raise your total daily dose without you realizing it.

How to Avoid Interactions

Before taking the S500 pill:

• Check the active ingredient on every medicine
• Look for acetaminophen, APAP, or paracetamol
• Tell your doctor or pharmacist about medicines and supplements you use
• Ask a pharmacist if you cannot identify an ingredient
• Avoid taking two acetaminophen-containing medicines together unless instructed to do so

These simple steps can lower the risk of accidental double dosing and make it easier to keep track of your total acetaminophen intake throughout the day.

Tips for Safe Use

Always take acetaminophen according to the instructions on your product label. Do not increase the dose or take it more often simply because pain or fever continues.

Also, keep track of medicines you take throughout the day. This is especially important when using cold, flu, headache, or prescription pain medicines because some of them may already contain acetaminophen.

Follow the Product Label

The white S500 acetaminophen 500 mg pill discussed here is an over-the-counter medicine. Follow its Drug Facts label unless your healthcare provider gives you different instructions.

If you already use a prescription medicine containing acetaminophen, include that amount when calculating your total daily intake. This can help prevent accidentally taking more acetaminophen than recommended.

Monitor for Side Effects

Pay attention to unusual symptoms while taking any medication. Stop using acetaminophen and seek medical help if you develop a serious rash, blisters, swelling, trouble breathing, yellowing of the skin or eyes, or other possible signs of a severe reaction or liver problem.

Also, contact a doctor if pain gets worse or lasts longer than 10 days, fever gets worse or lasts longer than three days, redness or swelling develops, or new symptoms appear.

Store Properly

Store the medicine at normal room temperature, ideally between 68°F and 77°F (20°C to 25°C) for the current S500 product. Keep the bottle tightly closed and protect it from excess heat and moisture. Also, store acetaminophen and other medications in a secure place where children cannot reach or accidentally access them.

Conclusion

The S500 pill discussed in this guide is a white, approximately 18 mm tablet containing acetaminophen 500 mg. It works as a pain reliever and fever reducer and may help with headaches, backaches, toothaches, muscular aches, minor arthritis pain, menstrual cramps, cold-related aches, and fever.

However, S 500 alone should not be used to identify every medication. Pills with the same or similar imprint may contain different drugs when their color, shape, or other characteristics differ. For this reason, always check the complete appearance and packaging of an unknown pill and ask a pharmacist if you cannot confirm what it is.

Most importantly, follow the directions on your exact product label. Avoid combining multiple medicines that contain acetaminophen, keep track of your total daily intake, and never take more than the recommended amount. Too much acetaminophen can cause severe liver damage and may require immediate medical care.

References

• DailyMed — S500 Acetaminophen 500 mg Product Label
• DailyMed — S 500 Acetaminophen Pill Label
• FDA — Acetaminophen Safety Information
• MedlinePlus — Acetaminophen Drug Information
• DailyMed — Acetaminophen and Ibuprofen
• FDA — Don’t Be Tempted to Use Expired Medicines