Before taking Lasix , you must give your detailed medical history to the treating doctor, making a special mention if you have ever suffered from any disease related to the kidney, liver, heart, or if you have ever suffered from gout, lupus, diabetes, anuria [disability of the body to make urine], an untreated mineral imbalance, hypercalcemia, or hypertension.

It's also important to let the physician know if you have any known allergies - especially to sulfa drugs, and inform the doctor about all the medications [prescription or OTC], as well as all nutritional supplements and herbal products you take. There are a number of drugs that interact with Furosemide, so when you give a complete list of all your medicines and supplements, the physician will be able to work out a proper dose regimen for you if you have to take Lasix also.

If you are diabetic, or have low potassium levels, while the physician will adjust your anti-diabetic medication, and give you a potassium supplement, you will also be required to go for laboratory tests so that your blood levels for sugar and potassium [and, if required, for other compounds] can be properly monitored. It is important for you to keep all your laboratory appointments.

Hypertensive patients on Lasix therapy will have to get their blood pressure regularly checked for a few months. If you have to undertake any surgery, it is also important for you to let the surgeon, or dentist, know that you are taking this loop diuretic.

Lasix can cause drowsiness, so elderly people on Furosemide therapy will have to be cautious and move around only when very essential; while those who drive, operate machinery, or perform hazardous activities, will have to be very alert when they are performing their chores, while using this loop diuretic. Alcohol, and alcoholic beverages, should be avoided for the same reasons.

Pregnant or lactating women should take this medicine only if their physician advises them to do so.

This drug is likely to increase your sensitivity to sunlight, or any strong light. If you are looking forward to getting a tan, it would be better to check with your physician or dermatologist on when you can do so. Till then, use sunscreens, wear protective clothing, sunglasses, and a hat.