Advil is a brand-name pain reliever whose active ingredient is ibuprofen, sold over the counter in 200 mg tablets and capsules. It belongs to a class of drugs called nonsteroidal anti-inflammatory drugs, commonly known as NSAIDs. People use it to treat headaches, muscle aches, menstrual cramps, toothaches, backaches, arthritis pain, cold symptoms, and fever.
How Advil Works in Your Body
Your body produces chemicals called prostaglandins whenever tissue is damaged or irritated. Prostaglandins trigger three responses: inflammation (swelling and redness), pain signaling, and fever. Ibuprofen works by blocking the enzymes that produce these chemicals, which is why a single pill can address pain, swelling, and fever at the same time.
Unlike some prescription anti-inflammatories that target only one of these enzymes, ibuprofen blocks both types, known as COX-1 and COX-2. This broad action makes it effective across a wide range of everyday pain, but it also explains some of its side effects, since COX-1 plays a protective role in your stomach lining.
What Advil Treats
The over-the-counter version covers mild to moderate pain: headaches, muscle soreness, menstrual cramps, toothaches, backaches, minor arthritis discomfort, and the aches that come with a common cold. It also reduces fever. Most people reach for it after a workout, during a period, or when a headache sets in.
At higher prescription doses, ibuprofen is used for more persistent inflammatory conditions like osteoarthritis, rheumatoid arthritis, gouty arthritis, and a spinal condition called ankylosing spondylitis. These uses involve ongoing treatment supervised by a doctor, not the occasional dose most people take at home.
How Quickly It Works
Pain relief typically begins within 30 to 60 minutes of taking a dose. The effects last about 4 to 6 hours, which is why the label allows repeat dosing at regular intervals. Liquid-filled capsule versions may kick in slightly faster because the ibuprofen is already dissolved.
Dosing for Adults and Children
The standard adult dose for mild to moderate pain is 200 to 400 mg every 4 to 6 hours as needed. For menstrual cramps specifically, 400 mg every 4 hours is the typical recommendation. The over-the-counter maximum is 1,200 mg in 24 hours unless a doctor directs otherwise. Prescription doses for chronic arthritis can go as high as 3,200 mg per day, but that level requires medical supervision.
Children under 6 months old should not take ibuprofen. For older children, dosing is based on weight rather than age. Children’s Advil comes in liquid form with a measuring syringe to make this easier. Doses can be repeated every 6 to 8 hours, which is a slightly longer interval than the adult schedule.
Available Formulations
Advil comes in several formats designed for different preferences and needs:
- Coated tablets: The classic form, containing 200 mg of ibuprofen per tablet.
- Liqui-Gels and Liqui-Gels Minis: Capsules filled with liquid ibuprofen, which some people find easier to swallow or faster-acting.
- Advil Dual Action: A caplet combining ibuprofen with acetaminophen (the active ingredient in Tylenol). This targets pain through two different pathways at once.
- Advil PM: Pairs ibuprofen with an antihistamine that causes drowsiness, intended for nighttime pain that interferes with sleep.
- Easy Open Arthritis Cap: Standard ibuprofen tablets in a bottle designed for people with limited grip strength.
Side Effects to Know About
The most common side effects involve the stomach. Because ibuprofen reduces the protective chemicals in your stomach lining, it can cause nausea, heartburn, or stomach pain, especially on an empty stomach. Taking it with food or a full glass of water helps. Long-term or high-dose use raises the risk of stomach ulcers and bleeding, which is why over-the-counter labels advise against using it for more than 10 consecutive days without medical guidance.
The cardiovascular risk is the other major concern. The FDA has strengthened its warning that NSAIDs, including ibuprofen, can increase the chance of heart attack or stroke. This risk rises with higher doses and longer use, but the FDA notes it can occur even in the first weeks of regular use. People with existing heart disease face greater risk, though it isn’t limited to them.
Less common side effects include fluid retention, dizziness, and ringing in the ears. Allergic reactions are rare but possible, particularly in people who are sensitive to aspirin.
Who Should Be Cautious
If you take blood thinners, ibuprofen can interfere with their effectiveness and increase bleeding risk. People on blood pressure medications should also be careful, since ibuprofen can raise blood pressure and reduce how well those drugs work. Combining ibuprofen with aspirin can blunt aspirin’s heart-protective effects if you’re taking a daily low dose for cardiovascular prevention.
People with a history of stomach ulcers, kidney problems, or heart disease should talk to their doctor before using ibuprofen regularly. The same applies during the third trimester of pregnancy, when NSAIDs can cause complications for the developing baby.
Advil vs. Other Pain Relievers
Advil and generic ibuprofen are identical in effect. The brand name doesn’t change the chemistry. Where ibuprofen differs from other common pain relievers is in what it does beyond pain relief. Acetaminophen (Tylenol) reduces pain and fever but does not reduce inflammation, making ibuprofen a better choice when swelling is part of the problem, like a sprained ankle or inflamed joint. Naproxen (Aleve) is another NSAID that works the same way as ibuprofen but lasts longer, around 8 to 12 hours per dose, so it requires fewer pills throughout the day.
The tradeoff is that ibuprofen’s shorter duration gives you more flexibility. If you only need a few hours of relief, it clears your system faster. For all-day coverage of chronic pain, naproxen is often more convenient.