Precautions
Before taking this medication, tell your doctor or pharmacist:
- If you are allergic to pseudoephedrine or guaifenesin; or if you have any other allergies. Also, inform your doctor if you have had a bad reaction to similar drugs (Sympathomimetics such as Ephedrine and Phenylephrine).
- If you are to undergo any surgery.
- If you are pregnant or breastfeeding.
- Your medical history, especially of:
- Breathing Problems (such as Emphysema, Chronic Bronchitis, Asthma, Smoker’s Cough)
- Cough With Blood or Large Amounts of Mucus
- High Blood Pressure
- Heart Disease (such as Chest Pain, Heart Failure, Heart Attack)
- Fast, Slow or Irregular Heartbeat, Diabetes
- A Certain Eye Problem (Glaucoma)
- Difficulty Urinating (such as Due to Enlarged Prostate)
- Overactive Thyroid (Hyperthyroidism)
This drug may cause dizziness, drowsiness or blurred vision. Avoid activities requiring alertness or clear vision such as driving until you are sure you can perform such activities safely. Limit the use of alcohol and certain other medications that cause drowsiness.
Older adults and children may be more sensitive to the side effects of this drug, especially dizziness, drowsiness, mental or mood changes, constipation, fast heartbeat, trouble urinating, or blood pressure changes.
Interactions
Drug interactions may either lessen the effectiveness of this drug or heighten the risk for severe side effects. It’s important to inform your doctor all the medication including prescription and non-prescription and herbal medicines you are taking or going to take.
Possible interactions with this drug are:
- Other Decongestants (taken by Mouth or Sprayed into the Nose)
- Tricyclic Antidepressants (such as Nortriptyline, Amitriptyline)
- Mao Inhibitors (Isocarboxazid, Linezolid, Methylene Blue, Moclobemide, Phenelzine, Procarbazine, Rasagiline, Selegiline, Tranylcypromine)
- Beta Blockers
- Reserpine
- Guanethidine
- Methyldopa
- Mecamylamine
The Guaifenesin in this product can interfere with the results of certain lab tests such as urine levels of certain acids. Make sure laboratory personnel and all your doctors know you use this drug to avoid false results.