Temporary blurred vision, temporary burning/stinging/itching/redness of the eye, watery eyes, dry eyes, dry mouth, feeling as if something is in the eye, headache, dizziness, or drowsiness may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Remember that your doctor has prescribed this medication because the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor right away if you have any serious side effects, including: vision changes, eye sensitivity to light, eye pain/swelling/discharge, slow/irregular heartbeat, muscle weakness, unusual tiredness, mental/mood changes, coldness/numbness/pain in the hands or feet, swelling ankles/feet, sudden unexplained weight gain, shortness of breath. Get medical help right away if you have any very serious side effects, including: dizziness that doesn't stop, trouble breathing, chest pain, weakness on one side of the body, trouble speaking, confusion, fainting. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Some products that may interact with this drug include: beta blockers taken by mouth (such as propranolol), certain antidepressants (SSRIs such as fluoxetine, tricyclics such as amitriptyline), digoxin, epinephrine, high blood pressure medications (such as clonidine, methyldopa), quinidine. Tell your doctor or pharmacist if you are using other products that cause drowsiness such as opioid pain or cough relievers (such as codeine, hydrocodone), alcohol, marijuana (cannabis), drugs for sleep or anxiety (such as alprazolam, lorazepam, zolpidem), muscle relaxants (such as carisoprodol, cyclobenzaprine), or antihistamines (such as cetirizine, diphenhydramine). Check the labels on all your medicines (such as allergy or cough-and-cold products) because they may contain ingredients that cause drowsiness. Ask your pharmacist about using those products safely.