Acetaminophen, butalbital, and caffeine: uses, dosing, safety
Last updated September 6, 2026.
**Acetaminophen, butalbital, and caffeine is a prescription combination headache medicine that pairs a pain reliever and fever reducer with a barbiturate sedative and a stimulant.** Acetaminophen reduces pain signaling, butalbital acts on the central nervous system to relax and sedate, and caffeine narrows blood vessels in the head and helps the other two ingredients work. The single most important safety point is the acetaminophen content: taking more than 4,000 mg of acetaminophen in 24 hours from all sources can cause severe liver injury, and butalbital adds a separate risk of sedation and physical dependence when the medicine is used often.
What does it treat?
This combination is approved for the relief of the symptom complex of tension headache, also called muscle contraction headache. That is the pattern of a dull, tight, pressing band of pain across the forehead, temples, or back of the head and neck, often with tight scalp and shoulder muscles, that has not responded to a simple pain reliever alone. Clinicians sometimes use it for migraine attacks as well, though it is not a first-line migraine treatment and it does not prevent headaches from coming back. You may see it sold as Fioricet, Esgic, Zebutal, Vanatol LQ, or a generic tablet, capsule, or oral solution. Related products add codeine (butalbital, acetaminophen, caffeine, and codeine phosphate) or replace acetaminophen with aspirin (Fiorinal), so check the exact ingredient list on your bottle before combining it with anything else.
How do you take it?
It comes as a tablet, a capsule, and an oral solution, usually 325 mg acetaminophen with 50 mg butalbital and 40 mg caffeine per tablet, 300 mg or 325 mg acetaminophen in the capsules, and 325 mg per 15 mL of solution. The usual adult dose is 1 or 2 tablets or capsules every 4 hours as needed, or 15 mL of solution every 4 hours as needed, with a hard ceiling of 6 tablets, capsules, or doses in 24 hours. Never take more than 4,000 mg of acetaminophen in a day counting every source, including cold and flu products, sleep aids, and other prescription pain pills. You can take it with or without food; taking it with food or milk helps if it upsets your stomach. There is no catch-up dose, since this is taken only when you have a headache, so if you skip a dose just take the next one when you need it and never double up. Call your doctor if you need it more than 2 or 3 days a week, if your headaches are getting more frequent, or if the pain lasts longer than 10 days, since frequent use can drive rebound headaches and dependence, and stopping abruptly after regular use can cause withdrawal.
Side effects to know
- Common: The most common effects are drowsiness, lightheadedness, dizziness, nausea, a feeling of being drunk or slowed down, and an upset stomach, and some people get jittery or have trouble sleeping from the caffeine.
- Serious: Stop the medicine and get medical help right away for signs of liver injury such as nausea with vomiting, pain in the upper right belly, dark urine, pale stools, unusual tiredness, or yellowing of the skin or eyes, and for any rash, especially blistering, peeling, or sores in the mouth, which can signal a rare severe skin reaction. Also seek urgent help for hives, wheezing, or swelling of the face, lips, or throat, and for very slow or shallow breathing or extreme sleepiness, which can happen when this medicine is combined with alcohol, opioids, or sedatives.
Who should not take it?
Do not take this medicine if you have had an allergic reaction to acetaminophen, butalbital, or caffeine, or if you have porphyria. Talk with a doctor first if you have liver disease, hepatitis, or drink alcohol regularly, if you have kidney disease, a history of depression or suicidal thoughts, a history of substance use or dependence, breathing problems such as sleep apnea or COPD, or a seizure disorder. Tell your clinician about every other medicine you take, since acetaminophen adds up across products, warfarin bleeding risk can rise with regular use, and butalbital adds to the sedating effect of opioids, benzodiazepines, muscle relaxants, sleep aids, antihistamines, and alcohol. Butalbital can also speed the breakdown of some drugs and make hormonal birth control less reliable. Avoid alcohol entirely while taking it, because the combination raises both liver injury risk and the risk of dangerously slowed breathing. In pregnancy there are no adequate studies, and regular use late in pregnancy has been linked to withdrawal symptoms in the newborn, so use it only if your clinician says the benefit is worth it. Butalbital, acetaminophen, and caffeine all pass into breast milk and butalbital can make a nursing baby sleepy, so discuss it before using it while breastfeeding.
When is it an emergency?
Call Poison Control at 1-800-222-1222 right away if you take more than the labeled amount or find that you doubled up with another acetaminophen product, even if you feel completely fine. Acetaminophen overdose often causes no symptoms for the first day, and treatment works best when it starts early, so do not wait to see what happens. Call 911 if someone becomes hard to wake, has slow, shallow, or stopped breathing, collapses, has a seizure, or shows signs of a severe allergic reaction such as swelling of the face, lips, or throat, hives with trouble breathing, or widespread blistering and peeling skin. Get same-day care for yellowing of the eyes or skin, persistent vomiting with right upper belly pain, or a sudden severe headache that is different from your usual one, especially with fever, stiff neck, weakness, confusion, or vision changes.
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Common questions
What is the maximum I can take in a day?
The label caps you at 6 tablets, capsules, or 15 mL doses in 24 hours. With the common 325 mg strength, 6 tablets equals 1,950 mg of acetaminophen, which fits under the 4,000 mg daily acetaminophen limit on its own. The trap is other products: cold and flu remedies, nighttime pain relievers, and prescription opioid combinations often contain acetaminophen too, and those all count toward the same 4,000 mg. Read the active ingredient panel on everything else you take that day. If you are over 65, drink alcohol, or have liver disease, your clinician may set a lower personal ceiling.
Can I drink alcohol while taking it?
No. Alcohol and acetaminophen together raise the risk of serious liver injury, and the FDA warns specifically about people who have three or more alcoholic drinks a day. Alcohol also adds to butalbital's sedating effect, which can slow your breathing and badly impair your coordination and judgment. There is no safe amount to pair with a dose. If you drink regularly, tell your clinician before starting this medicine so they can pick something else or set a lower limit.
Is it safe during pregnancy or while breastfeeding?
There are no adequate and well controlled studies in pregnant people, so the label says to use it during pregnancy only if clearly needed. Butalbital is a barbiturate, and regular use late in pregnancy has been linked to withdrawal symptoms in newborns, including seizures in reported cases. All three ingredients pass into breast milk, and butalbital can make a nursing infant unusually sleepy or feed poorly. Talk with your obstetric clinician before using it either way, since acetaminophen alone is often the preferred option for headache in pregnancy.
How will I know if I have taken too much acetaminophen?
You often will not know from how you feel, which is what makes it dangerous. Early acetaminophen overdose can cause nausea, vomiting, sweating, loss of appetite, and general unwellness, or no symptoms at all for the first 24 hours. Liver damage signs like yellowing of the skin or eyes, dark urine, and right upper belly pain show up later, once the injury is already underway. Call Poison Control at 1-800-222-1222 immediately if you suspect you took too much, even with no symptoms, because the antidote works best when it is given early.
Do I have to take it with food?
No, you can take it with or without food. Food slows how fast it is absorbed a little but does not change how well it works overall. If it upsets your stomach, take it with food or a glass of milk. Take it with a full glass of water and stay upright for a few minutes afterward.
What medicines interact with it?
Anything else containing acetaminophen is the biggest concern, because the doses add together toward the 4,000 mg daily limit. Butalbital adds to the sedation of opioids, benzodiazepines, muscle relaxants, sleep aids, sedating antihistamines, and alcohol, and that combination can slow your breathing. Butalbital can also speed the breakdown of other drugs, which may make hormonal birth control, some steroids, and certain seizure medicines less effective. Regular acetaminophen use can raise the bleeding risk from warfarin, so your INR may need checking. Give your clinician or pharmacist a full list of your prescriptions, over-the-counter products, and supplements before you start.
Can it cause dependence or rebound headaches?
Yes. Butalbital is a barbiturate, and using this medicine on a regular schedule can lead to physical dependence and tolerance, where you need more for the same relief. Taking it on more than about 2 days a week can also cause medication overuse headache, where the treatment itself keeps the headaches coming. Stopping suddenly after regular use can cause withdrawal, including tremor, anxiety, insomnia, and in serious cases seizures, so taper with your clinician rather than quitting cold. If you have been reaching for it most days, bring that up so you can get a preventive plan instead.