Last updated on RxList: 2/16/2021
Esgic Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

What Is Esgic?

Esgic (butalbital, acetaminophen, and caffeine capsule) is a combination of a barbiturate, a non-salicylate analgesic and antipyretic, and a central nervous system stimulant indicated for the relief of the symptom complex of tension (or muscle contraction) headache.

What Are Side Effects of Esgic?

Common side effects of Esgic include:

  • drowsiness
  • lightheadedness
  • dizziness
  • sedation
  • shortness of breath
  • nausea
  • vomiting
  • abdominal pain, and
  • intoxicated feeling

Less common side effects of Esgic include headache, increased urination, shaking (tremor), dry mouth, tingling, agitation, fainting, fatigue, heavy eyelids, high energy, hot spells, numbness, sluggishness, seizure, confusion, excitement, depression, sweating, difficulty swallowing, constipation, heartburn, gas, fast heart rate, leg pain, muscle fatigue, itching, fever, earache, stuffy nose, ringing in the ears, euphoria, allergic reactions, and skin rash.

Dosage for Esgic

The dose of Esgic is one or two capsules every four hours. The total daily dosage of Esgic should not exceed 6 capsules.

What Drugs, Substances, or Supplements Interact with Esgic?

Esgic may interact with monoamine oxidase (MAO) inhibitors, other narcotic analgesics, alcohol, general anesthetics, tranquilizers such as chlordiazepoxide, sedative-hypnotics, or other CNS depressants. Tell your doctor all medications and supplements you use.

Esgic During Pregnancy and Breastfeeding

During pregnancy, Esgic should be taken only if prescribed. It is unknown if it would affect a fetus. All the drugs in Esgic pass into breast milk, and breastfeeding while taking Esgic is not recommended. Withdrawal symptoms may occur if you suddenly stop taking Esgic.

Additional Information

Our Esgic (butalbital, acetaminophen, and caffeine capsule) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


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Esgic Consumer Information

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Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

In rare cases, acetaminophen may cause a severe skin reaction that can be fatal. This could occur even if you have taken acetaminophen in the past and had no reaction. Stop taking this medicine and call your doctor right away if you have skin redness or a rash that spreads and causes blistering and peeling. If you have this type of reaction, you should never again take any medicine that contains acetaminophen.

Stop using this medicine and call your doctor at once if you have:

  • confusion, seizure (convulsions);
  • shortness of breath;
  • a light-headed feeling, like you might pass out; or
  • nausea, upper stomach pain, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).

Common side effects may include:

  • drowsiness, dizziness;
  • feeling anxious or restless;
  • drunk feeling; or
  • sleep problems (insomnia).

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Esgic (Butalbital, Acetaminophen and Caffeine Capsules)


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Esgic Professional Information


Frequently Observed

The most frequently reported adverse reactions are drowsiness, lightheadedness, dizziness, sedation, shortness of breath, nausea, vomiting, abdominal pain, and intoxicated feeling.

Infrequently Observed

All adverse events tabulated below are classified as infrequent.

Central Nervous System: headache, shaky feeling, tingling, agitation, fainting, fatigue, heavy eyelids, high energy, hot spells, numbness, sluggishness, seizure. Mental confusion, excitement or depression can also occur due to intolerance, particularly in elderly or debilitated patients, or due to overdosage of butalbital.

Autonomic Nervous System: dry mouth, hyperhidrosis.

Gastrointestinal: difficulty swallowing, heartburn, flatulence, constipation.

Cardiovascular: tachycardia.

Musculoskeletal: leg pain, muscle fatigue.

Genitourinary: diuresis.

Miscellaneous: pruritus, fever, earache, nasal congestion, tinnitus, euphoria, allergic reactions.

Several cases of dermatological reactions, including toxic epidermal necrolysis and erythema multiforme, have been reported.

The following adverse drug events may be borne in mind as potential effects of the components of this product. Potential effects of high dosage are listed in the OVERDOSE section.

Acetaminophen: allergic reactions, rash, thrombocytopenia, agranulocytosis.

Caffeine: cardiac stimulation, irritability, tremor, dependence, nephrotoxicity, hyperglycemia.

Read the entire FDA prescribing information for Esgic (Butalbital, Acetaminophen and Caffeine Capsules)

© Esgic Patient Information is supplied by Cerner Multum, Inc. and Esgic Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.

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