As winter approaches, people across North India prepare for colder mornings, shorter days and changes in their daily routines. Many also tend to drink less water because they feel less thirsty, while reduced sweating changes how the body loses fluids.

Although these changes may seem minor, they can matter for people taking medicines for high blood pressure, heart disease or kidney problems.One important group of medicines to understand is diuretics, commonly known as water pills. These medicines help the kidneys remove excess salt and water through urine.

They are widely prescribed to control blood pressure and manage fluid buildup in the body. However, if fluid loss becomes excessive, some patients may experience dizziness, low blood pressure, electrolyte disturbances or changes in kidney function.Dr Anant Joshi, physician and nephrologist in Delhi, highlights why patients and families should understand the ingredients in their regular blood pressure medicines.

The key is not to fear these medicines or stop taking them during winter, but to recognise warning signs and seek medical advice when needed.1. YOUR BP TABLET MAY ALREADY CONTAIN A DIURETICMany people associate water pills with medicines such as furosemide and torsemide.

However, other commonly prescribed medicines, including hydrochlorothiazide (HCTZ), chlorthalidone and indapamide, also belong to this group. These medicines are often prescribed to people with hypertension.

In some cases, a diuretic is combined with another blood pressure medicine in a single tablet. For example, a tablet containing telmisartan and hydrochlorothiazide combines two medicines that work differently to help control blood pressure.As a result, patients may take a diuretic every morning without knowing that their prescription contains one.

Doctors advise patients to check the composition printed on their medicine strips and consult their physician or pharmacist if they are unsure about the ingredients. Brand names alone may not make a medicine's composition clear.2.

WHY WINTER CAN AFFECT FLUID BALANCEDuring winter, many people drink less water because they do not feel as thirsty as they do in summer. Sweating also generally decreases in colder weather.

For some people taking diuretics, these changes may contribute to a shift in fluid balance.If the body loses more fluid than it can replace, blood volume may decrease. This can cause blood pressure to fall and may reduce blood flow to the kidneys, potentially leading to a rise in creatinine levels.However, cold weather can also cause blood vessels to narrow, which may increase blood pressure in some people.

Therefore, winter does not automatically mean that a patient's diuretic dose should be reduced. The right treatment depends on blood pressure readings, fluid levels, underlying medical conditions and kidney function.3.

FIVE WARNING SIGNS FAMILIES SHOULD NOT IGNOREPeople taking diuretics and their caregivers should watch for changes in health, especially among older adults.Low blood pressure: Readings that are lower than usual, particularly when accompanied by weakness or light-headedness, need attention.Dizziness on standing: Feeling faint when getting out of bed or rising from a chair may indicate a drop in blood pressure and can increase the risk of falls.Weakness, cramps or unusual thirst: These symptoms may occur due to fluid loss or changes in sodium and potassium levels, although other conditions can cause them too.Unexpected weight loss: A sudden decrease in weight may sometimes reflect fluid loss, particularly in patients who were previously experiencing swelling.A rise in creatinine: Higher creatinine levels may indicate a change in kidney function. Dehydration is one possible cause, but medical assessment is needed to identify the reason.4.

HOW TO STAY SAFE WHILE TAKING DIURETICSPatients should review their prescriptions with their doctors and monitor blood pressure as advised. Those with heart failure or fluid retention may also need to track their weight and watch for swelling or breathlessness.Kidney function and electrolyte tests, including creatinine, sodium and potassium, may be required when symptoms change or medication doses are adjusted.Fluid intake needs individual attention.

Patients with heart failure, kidney disease or low sodium levels may have been advised to restrict fluids. They should not increase their water intake without medical guidance.

Similarly, anyone experiencing dizziness or weakness should seek advice rather than changing their medicine independently.5. DO NOT STOP YOUR WATER PILL JUST BECAUSE IT IS WINTERDiuretics are important medicines for many patients, particularly those with heart failure and fluid overload.

Stopping them without medical advice can worsen swelling, fluid build-up and breathlessness.At the same time, excessive fluid loss can contribute to low blood pressure, falls, electrolyte disturbances and kidney problems. Maintaining the right balance is therefore essential.The safest approach is to continue prescribed treatment unless a doctor advises otherwise.

Patients should report new symptoms, follow their recommended monitoring plan and discuss any concerns about fluid intake or medication doses with their physician.As winter sets in, checking the ingredients of an elderly family member's blood pressure medicine can be a useful first step. Understanding what a medicine contains, recognising warning signs and seeking timely medical advice can help patients manage their condition safely through the colder months.- Ends