Common side effects:
Dizziness, lightheadedness, drowsiness, headache, and shortness of breath may occur as your body adjusts to the medication. Trouble sleeping, decreased sexual ability, stomach upset, nausea, diarrhea, sore throat, cold hands and feet, dry eyes, tingling, numbness, and weakness may also occur.
This drug may reduce blood flow to your hands and feet, causing them to feel cold. Smoking may worsen this effect. Avoid tobacco use and dress warmly.
Tell your doctor immediately if any of these unlikely but serious side effects occur: slow/irregular heartbeat, back pain, mental/mood changes (e.g., depression, hallucinations), trouble breathing, swelling of the ankles/feet/legs, joint pain, easy bruising/bleeding, increased thirst/urination, vision changes, slow wound healing, sweating, confusion, fainting, stomach/abdominal pain, blue fingers/toes/nails, finger/toe/leg cramps, unexplained sudden weight gain.
A very serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction may include: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.