Zephrex Oral
In Depth
- Uses and How to Use
- Dosage and Storage
- Precautions and Side Effects
- Drug Interactions
- Drug Images
Pronounced: (gweye-FEN-eh-sin/sue-doh-eff-ED-rin)
Zephrex Oral Interactions
Your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor or pharmacist first.
This drug should not be used with the following medications because very serious interactions may occur:
- MAO inhibitors (e.g., furazolidone, isocarboxazid, linezolid, moclobemide, phenelzine, procarbazine, rasagiline, selegiline, tranylcypromine)
Avoid taking MAO inhibitors within 2 weeks before, during, and after treatment with this medication. In some cases a serious, possibly fatal drug interaction may occur.
If you are currently using any of these medications, tell your doctor or pharmacist before starting this product.
Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of:
- other decongestants (taken by mouth or sprayed into the nose)
- products containing caffeine (including beverages such as coffee, tea, some sodas)
- digoxin
- tricyclic antidepressants (e.g., nortriptyline, amitriptyline)
Pseudoephedrine may decrease the effectiveness of some blood pressure medications (e.g., beta blockers, calcium channel blockers, reserpine, guanethidine, methyldopa, mecamylamine).
Pseudoephedrine may worsen the serious side effects of some medications used for migraine headaches (e.g., sumatriptan, naratriptan, zolmitriptan, ergotamine). Consult your pharmacist or doctor for more details.
Check the labels on all your medicines (e.g., cough-and-cold products, diet aids) because they may contain ingredients that could increase your heart rate or blood pressure. Before using these products with this medication, ask your pharmacist how to use them safely.
Pseudoephedrine and guaifenesin are available in both prescription and nonprescription products. Check the labels of all your medications carefully to make sure you are not taking more than one product containing these medications.
The guaifenesin in this product can affect the results of certain lab tests (e.g., uric acid levels, 5-hydroxyindoleacetic acid levels, vanillylmandelic acid levels). Make sure laboratory personnel and all your doctors know you use this drug.
This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.
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