Headache, swelling of the ankles/feet, dizziness, lightheadedness, flushing, nausea, stomach pain, feeling your heart beating in your chest, tiredness, constipation, and difficulty sleeping may occur as your body adjusts to the medication. If any of these effects persist or worsen, notify your doctor or pharmacist promptly.
To minimize dizziness and lightheadedness, get up slowly when rising from a seated or lying position.
To prevent constipation, maintain a diet adequate in fiber, drink plenty of water, and exercise. If you become constipated while using this drug, consult your pharmacist for help in selecting a stool softener.
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 immediately if any of these unlikely but serious side effects occur: shortness of breath, persistent tiredness, fast/irregular/very slow heartbeat, muscle cramps/pain, joint pain, unusual dreams, vision changes, mental/mood changes (e.g., depression, anxiety, nervousness), decreased sexual ability/desire, fainting.
Tell your doctor immediately if any of these rare but very serious side effects occur: severe abdominal pain, dark urine, severe nausea/vomiting, severe constipation, difficult/increased urination, yellowing eyes/skin, new or worsening chest pain, sudden dizziness/fainting, signs of infection (e.g., fever, chills, persistent sore throat), easy bruising/bleeding.
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, 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.