There are no seven clinical categories of people who should not take hydrochlorothiazide tablets. People who should not take hydrochlorothiazide tablets are mainly those who have severe hepatic or renal impairment, pregnancy or lactation, metabolic diseases, electrolyte disorders. Athletes, people suffering from diabetes, hypercalcemia should also use the drug with caution or under the guidance of a doctor. Hydrochlorothiazide belongs to diuretics, which can affect the absorption and secretion of sodium, potassium, water, etc. in the renal tubules, so this drug is commonly used for diuresis or blood pressure lowering. If the patient has severe renal impairment, especially anuria, in this case, the application of hydrochlorothiazide will lead to drug accumulation causing poisoning. The presence of severe hepatic function impairment application of diuretics is likely to aggravate water and electrolyte metabolic disorders, aggravating the condition. Since hydrochlorothiazide can pass through the placenta, it can not be used in pregnant women, and the drug can be metabolized through breast milk, so it should not be used in lactating women. Hydrochlorothiazide affects uric acid metabolism, so it should also be used with caution in people with hyperuricemia or a history of gout. Hydrochlorothiazide is classified as a prohibited drug for athletes because its application can reduce body weight or facilitate the metabolism of prohibited drugs for a short period of time before a competition. Hydrochlorothiazide has the effect of sodium and potassium excretion, so patients with severe low sodium and potassium should also be used with caution. In addition to the above groups, patients with diabetes should use it under medical supervision because hydrochlorothiazide decreases the effect of hypoglycemic drugs. Hydrochlorothiazide can also affect the metabolism of urinary calcium, so hypercalcemia should also be used with caution. Specifically whether it is suitable for the application of hydrochlorothiazide, you need to go to the hospital, under the guidance of a professional doctor to take the drug.