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What happens if I miss a dose (All Day Allergy-D, Zyrtec-D)?

Take the missed dose as soon as you remember. If it is almost time for your next dose, wait until then to take the medicine and skip the missed dose. Do not take extra medicine to make up the missed dose.

What happens if I overdose (All Day Allergy-D, Zyrtec-D)?

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

Overdose symptoms may include feeling restless or nervous, headache, nausea, vomiting, sweating, anxiety, drowsiness, increased thirst, fast or pounding heartbeats, trouble sleeping, or problems with urination.

What should I avoid while taking cetirizine and pseudoephedrine (All Day Allergy-D, Zyrtec-D)?

Avoid taking diet pills, caffeine pills, or other stimulants (such as ADHD medications) without your doctor's advice. Taking a stimulant together with pseudoephedrine can increase your risk of unpleasant side effects.

Do not use any other over-the-counter cold medication without first asking your doctor or pharmacist. Pseudoephedrine is contained in many medicines available over the counter. If you take certain products together you may accidentally take too much of this drug. Read the label of any other medicine you are using to see if it contains pseudoephedrine.

Cetirizine 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.

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

What other drugs will affect cetirizine and pseudoephedrine (All Day Allergy-D, Zyrtec-D)?

Tell your doctor if you regularly use other medicines that make you sleepy (such as other cold or allergy medicine, narcotic pain medicine, sleeping pills, muscle relaxers, and medicine for seizures, depression, or anxiety). They can add to sleepiness caused by cetirizine.

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

• digoxin (digitalis, Lanoxin);
• blood pressure medication, especially methyldopa (Aldomet), mecamylamine (Inversine), or reserpine; or
• diet pills, stimulants, or ADHD medications.

This list is not complete and there may be other drugs that can interact with cetirizine and pseudoephedrine. Tell your doctor about all your prescription and over-the-counter medications, vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start a new medication without telling your doctor.

Where can I get more information?

Your pharmacist can provide more information about cetirizine and pseudoephedrine.

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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