Before taking this product, tell your doctor or pharmacist:
- If you are allergic to any of its ingredients; or if you have any other allergies.
- If you are pregnant or breastfeeding.
- If you are to undergo any surgery.
- Your medical history, especially of:
- Breathing Problems (such as Asthma, Emphysema)
- Heart Problems
- High Blood Pressure
- Kidney Problems
- Liver Disease
- Stomach or Intestinal Problems (such as Ulcers, Blockage)
- Overactive Thyroid (Hyperthyroidism)
- Difficulty Urinating (such as Due to Enlarged Prostate)
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.
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:
- Antihistamines Applied to the Skin (such as Diphenhydramine Cream, Ointment, Spray)
- Blood Pressure Medications (Especially Reserpine, Guanethidine, Methyldopa, Beta Blockers such as Atenolol, or Calcium Channel Blockers such as Nifedipine)
- MAO Inhibitors (Isocarboxazid, Linezolid, Methylene Blue, Moclobemide, Phenelzine, Procarbazine, Rasagiline, Selegiline, Tranylcypromine)
- Opioid Pain or Cough Relievers (such as Codeine, Hydrocodone)
- Drugs for Sleep or Anxiety (such as Alprazolam, Lorazepam, Zolpidem)
- Muscle Relaxants (such as Carisoprodol, Cyclobenzaprine)
- Other Antihistamines (such as Cetirizine, Diphenhydramine)
This medication may interfere with certain medical or laboratory tests such as brain scan for Parkinson’s disease. Make sure laboratory personnel and all your doctors know you use this drug to avoid false results.