Along with its needing effects, a drug may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
The following side effects may be causing by blood clots, which could lead to a heart attack or a stroke Stop taking this drug and get emergency help immediately if any of the following side effects was happen
More common
Shortness of breath
Less common
Chest pain
Rare
Continuing or severe nervousness; cough; dizziness or lightheadedness; fainting; fast heartbeat; heart attack; increased sweating; nausea; pain in chest, groin, or legs, especially the calves; severe, sudden headache; slurred speech; severe and sudden, unexplained shortness of breath; sudden loss of coordination; sudden, severe weakness or numbness in arm or leg; vision changes
Always check with your family doctor as soon as possible if any of the following side effects was happen
Less common
Bone fracture; breast pain; chills, fever, or flu-like symptoms; mental depression; swelling of feet or lower legs
Rare
Vaginal bleeding
More common side effects may occur that usually don't needed medical attention. These side effects may go away during treat as your body adjusts to the drug. However, check with your family doctor if any of the following side effects continue or are bothersome:
More common
Back pain; bone pain; hot flashes - sudden sweating and feeling of warmth; joint pain; muscle pain
Less common
Anxiety; confusion; constipation; diarrhea; dry mouth; headache; increased thirst and urination; loss of appetite or weight loss; metallic taste; skin rash or itching; sleepiness; spinning or whirling sensation causing loss of balance; stomach pain or upset; trouble sleeping; unusual tiredness; vomiting; weakness; weight gain
Letrozole sometimes causes a loss of hair.
More common side effects not listed above may also occur in some diseaseds. If you have any other problems, check with your family doctor.