Precautions
Before taking this medication, tell your doctor or pharmacist:
- If you are allergic to it; or if you have any other allergies.
- If you are to undergo any surgery.
- If you are pregnant or breastfeeding.
- Your medical history, especially of:
- Abdominal Problems (e.g., Chronic Constipation, Ileus, Gallbladder Disease, Pancreatitis)
- Adrenal Gland Problem (e.g., Addison’s Disease)
- Blood Vessel Problems (e.g., Raynaud’s Disease, Low Blood Flow to the Brain, Legs, Hands)
- Certain Brain Disorders (e.g., Head Injury, Tumor, Increased Pressure in the Brain)
- Breathing Problems (e.g., Asthma, Emphysema, Sleep Apnea)
- Diabetes
- Glaucoma
- Heart Problems
- High Blood Pressure
- Kidney Problems
- Liver Disease
- Mental or Mood Problems (e.g., Depression, Psychosis)
- Thyroid Problems (e.g., Hyperthyroidism, Hypothyroidism)
- Trouble Urinating (e.g., Due to Enlarged Prostate)
- Use or Abuse of Drugs or Alcohol
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 Anticholinergic Drugs (e.g., Benztropine, Belladonna Alkaloids)
- Beta Blockers (e.g., Metoprolol, Atenolol)
- Cimetidine
- Certain Medications for High Blood Pressure (Guanethidine, Methyldopa, Reserpine)
- Narcotic Antagonists (e.g., Naltrexone, Naloxone)
- Tricyclic Antidepressants (e.g., Amitriptyline, Desipramine)
- Mao Inhibitors (Isocarboxazid, Linezolid, Methylene Blue, Moclobemide, Phenelzine, Procarbazine, Rasagiline, Selegiline, Tranylcypromine)
- Opioid Pain or Cough Relievers (such as Codeine, Hydrocodone)
- Alcohol
- Drugs for Sleep or Anxiety (such as Alprazolam, Lorazepam, Zolpidem)
- Muscle Relaxants (such as Carisoprodol, Cyclobenzaprine)
- Antihistamines (such as Cetirizine, Diphenhydramine)
This medication may interfere with certain urine laboratory tests such as 5-HIAA levels, VMA levels, and amylase or lipase levels. Make sure laboratory personnel and all your doctors know you use this drug to avoid false results.