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What happens if I miss a dose (Maxiphen CD, Maxiphen CDX)?

Since cough or cold medicine is usually taken only as needed, you may not be on a dosing schedule. If you are taking the medication regularly, take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at your next regularly scheduled time. Do not take extra medicine to make up the missed dose.

What happens if I overdose (Maxiphen CD, Maxiphen CDX)?

Seek emergency medical attention if you think you have used too much of this medicine. An overdose of codeine can be fatal.

Overdose symptoms may include extreme dizziness or drowsiness, nausea, vomiting, stomach, sweating, confusion, hallucinations, cold and clammy skin, blue-colored lips or fingernails, weak or limp muscles, pinpoint pupils, weak pulse, slow breathing, fainting, or seizures (convulsions).

What should I avoid while taking codeine, guaifenesin, and phenylephrine (Maxiphen CD, Maxiphen CDX)?

This medication 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.

Do not use any other over-the-counter cough, cold, pain, or allergy medication without first asking your doctor or pharmacist. Guaifenesin and phenylephrine are contained in many medicines available over the counter. If you take certain products together you may accidentally take too much of a certain drug. Read the label of any other medicine you are using to see if it contains guaifenesin or phenylephrine.

Avoid drinking alcohol. It can increase some of the side effects of this medication.

What other drugs will affect codeine, guaifenesin, and phenylephrine (Maxiphen CD, Maxiphen CDX)?

Before taking this medication, tell your doctor if you regularly use other medicines that make you sleepy (such as allergy medicine, narcotic pain medicine, sleeping pills, muscle relaxers, and medicine for seizures, depression, or anxiety). They can add to sleepiness caused by codeine or guaifenesin.

Also tell your doctor if you are using any of the following drugs:

• medicines to treat high blood pressure;
• indomethacin (Indocin);
• mecamylamine (Inversine);
• methyldopa (Aldomet);
• reserpine;
• a beta-blocker such as atenolol (Tenormin), carteolol (Cartrol), metoprolol (Lopressor, Toprol), nadolol (Corgard), propranolol (Inderal), sotalol (Betapace), timolol, and others; or
• an antidepressant such as amitriptyline (Elavil), clomipramine (Anafranil), imipramine (Janimine, Tofranil), and others.

This list is not complete and there may be other drugs that can interact with codeine, guaifenesin, and phenylephrine. 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 can provide more information about codeine, guaifenesin, and phenylephrine.

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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