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Low levels of potassium or magnesium in the blood may also increase your risk of QT prolongation. This risk may increase if you use certain drugs (such as diuretics/"water pills") or if you have conditions such as severe sweating, diarrhea, or vomiting. Talk to your doctor about using doxepin safely.

This drug may make you dizzy or drowsy or cause blurred vision. Do not drive, use machinery, or do any activity that requires alertness or clear vision until you are sure you can perform such activities safely. Limit alcoholic beverages.

To reduce dizziness and lower the risk of fainting, get up slowly when rising from a sitting or lying position.

Before having surgery, tell your doctor or dentist that you are using this medication.

If you have diabetes, this drug may make your blood sugar levels harder to control. Check your blood sugar levels regularly as directed by your doctor. Tell your doctor immediately if you have symptoms of high or low blood sugar such as fast heartbeat, increased thirst/urination, shakiness, unusual sweating, or hunger. Your anti-diabetic medication or diet may need to be adjusted.

Caution is advised when using this drug in the elderly because they may be more sensitive to its side effects, especially dizziness, drowsiness, confusion, and difficulty urinating.

During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.

This medication passes into breast milk and could have undesirable effects on a nursing infant. Therefore, breast-feeding is not recommended while using this drug. Consult your doctor before breast-feeding.

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