The usage and dosage of Finasteride need to be adjusted according to the indications. For special populations, special attention should be paid to pregnancy risks, liver function effects, and contraindications for children. The dosage regimen and monitoring requirements vary depending on the characteristics of the population.

1. Usage and dosage

(1) Male hair loss: The recommended dosage is 1mg orally per day, which can be taken before or after meals. The medication should be continued for at least 3 months to show initial effects.

(2) Benign prostatic hyperplasia: Take 5mg orally daily and can be combined with doxycycline. The whole tablet should not be broken when swallowed to prevent pregnant women from coming into contact with broken pills.

(3) Dose adjustment: Patients with renal insufficiency usually do not need adjustment, while those with severe liver dysfunction should use it with caution and monitor for adverse reactions.

2. Medication for special populations

(1) Pregnancy and lactation period

Pregnant women are prohibited from using and should avoid contact with pill fragments, as the medication may be indirectly exposed through semen. The safety of breastfeeding has not been established, and it is recommended to suspend breastfeeding.

(2) Children

Male hair loss patients under 18 years old are prohibited, and indications for prostate hyperplasia are limited to adults. Lack of data on the safety and efficacy of medication for children.

(3) Elderly people

Patients over 65 years old do not need to adjust their dosage, but liver function monitoring should be strengthened as age-related decline in liver metabolism may affect drug clearance.

(4) Liver dysfunction

Patients with mild to moderate damage should be cautious and monitored for adverse reactions. Patients with severe liver dysfunction should avoid using it as it may significantly increase blood drug concentrations.

(5) Renal insufficiency

Patients with varying degrees of renal dysfunction do not need to adjust the dosage, but patients with end-stage renal disease need to closely monitor drug-related side effects.