What happens if I overdose?

Seek emergency medical attention if you think you have used too much of this medicine.

Symptoms of an overdose of this medication may include tremors (uncontrolled shaking); increased heart rate; sweating; confusion or restless feeling; nausea, stomach pain, fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes); or seizure (convulsions).

What should I avoid while taking acetaminophen, caffeine, and phenyltoloxamine?

Avoid drinking alcohol, which can increase some of the side effects of this medication. Do not use any other over-the-counter cough, cold, allergy, or pain medication without first asking your doctor or pharmacist. Acetaminophen is contained in many cold and pain medicines available over the counter. If you take certain products together you may accidentally take too much acetaminophen. Read the label of any other medicine you are using to see if it contains acetaminophen.

Avoid using other medicines that make you sleepy (such as cold medicine, other pain medication, muscle relaxants). They can add to sleepiness caused by acetaminophen, caffeine, and phenyltoloxamine.

Avoid using other sources of caffeine, such as coffee, tea, or caffeinated soft drinks.

Acetaminophen, caffeine, and phenyltoloxamine can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert.

What are the possible side effects of acetaminophen, caffeine, and phenyltoloxamine?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have any of these serious side effects:

fast or pounding heartbeat;
easy bruising, unusual bleeding or weakness;
feeling light-headed, fainting;
urinating less than usual;
increased thirst and increased urination;
muscle weakness, lack of coordination; or
jaundice (yellowing of the skin or eyes).

Other less serious side effects are more likely to occur, such as:

feeling nervous or irritable;
sleep problems (insomnia);
dizziness or drowsiness;
dry mouth, nose or throat;
mild itching or skin rash;
upset stomach, nausea, cramps, or diarrhea;
trouble concentrating; or
blurred vision.

Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.

What other drugs will affect acetaminophen, caffeine, and phenyltoloxamine?

Before taking this medication, tell your doctor if you are using any of the following drugs:

a blood thinner such as warfarin (Coumadin);
phenobarbital; or
aspirin.

If you are using any of these drugs, you may not be able to take acetaminophen, caffeine, and phenyltoloxamine, or you may need dosage adjustments or special tests during treatment.

There may be other drugs not listed that can affect this medication. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Where can I get more information?

Your pharmacist has more information about acetaminophen, caffeine, and phenyltoloxamine written for health professionals that you may read.

What does my medication look like?

Acetaminophen, caffeine, and phenyltoloxamine is available with a prescription under the brand name Flextra. Other brand or generic forms may also be available. Ask your pharmacist any questions you have about this medication, especially if it is new to you.

Flextra 425/35/45 mg--orange capsule

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

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