Fioricet Side Effects

Get emergency medical help if you have signs of an allergic reaction to Fioricet: 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 Fioricet 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.

Minor Side Effects

Some of the side effects that can occur with acetaminophen / butalbital / caffeine may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

More common:

  • Relaxed and calm
  • sleepiness

Incidence not known:

  • Anxiety
  • bloated
  • constipation
  • continuing ringing or buzzing or other unexplained noise in the ears
  • depression
  • earache
  • excess air or gas in the stomach or intestines
  • false or unusual sense of well-being
  • full feeling
  • hearing loss
  • heartburn
  • heavy eyelids
  • high energy
  • hot spells
  • hyperventilation
  • irritability
  • numbness
  • pain in the leg
  • passing gas
  • sluggishness
  • stuffy nose
  • tingling sensation

Major Side Effects

You should check with your doctor immediately if any of these side effects occur when taking acetaminophen / butalbital / caffeine:

More common:

  • Lightheadedness
  • shortness of breath

Incidence not known:

  • Abdominal or stomach pain
  • black, tarry stools
  • bleeding gums
  • blistering, peeling, or loosening of the skin
  • blood in the urine or stools
  • blurred vision
  • change in the frequency of urination or amount of urine
  • chills
  • cough
  • diarrhea
  • difficulty with breathing
  • difficulty with swallowing
  • dizziness
  • drowsiness
  • dry mouth
  • fainting
  • fast, pounding, or irregular heartbeat or pulse
  • flushed or dry skin
  • fruit-like breath odor
  • hives, itching, or skin rash
  • increased hunger
  • increased thirst
  • increased urination
  • joint or muscle pain
  • loss of appetite
  • nausea or vomiting
  • pinpoint red spots on the skin
  • puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
  • red skin lesions, often with a purple center
  • red, irritated eyes
  • seizures
  • shakiness in the legs, arms, hands, or feet
  • sore throat
  • sores, ulcers, or white spots in the mouth or on the lips
  • sweating
  • swelling of the feet or lower legs
  • tightness in the chest
  • trembling or shaking of the hands or feet
  • troubled breathing
  • unexplained weight loss
  • unusual bleeding or bruising
  • unusual tiredness or weakness
  • weakness

If any of the following symptoms of overdose occur while taking acetaminophen / butalbital / caffeine, get emergency help immediately:

Symptoms of overdose:

  • Confusion as to time, place, or person
  • dark urine
  • difficult or painful urination
  • dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  • fever
  • general feeling of discomfort or illness
  • hallucinations
  • headache
  • holding false beliefs that cannot be changed by fact
  • increased sweating
  • irregular, fast or slow, or shallow breathing
  • light-colored stools
  • loss of appetite
  • pale or blue lips, fingernails, or skin
  • restlessness
  • sudden decrease in the amount of urine
  • sweating
  • trouble sleeping
  • unpleasant breath odor
  • unusual excitement, nervousness, or restlessness
  • vomiting of blood
  • yellow eyes or skin