The severity of the side effects of taking Selodosin is related to the specific situation of the patient and cannot be clearly judged. In clinical practice, after taking Selodosin, dizziness, dry mouth, skin rash, etc. can occur in mild cases, while in severe cases, atrial fibrillation, arrhythmia, ejaculation and erectile dysfunction and other side effects are observed. Therefore, the severity of side effects varies from person to person, and patients should take the medication as prescribed by the doctor and give feedback in due course. Side effects such as dry mouth, dizziness, insomnia, headache, gastritis, atrial fibrillation, drowsiness, rash, diarrhea, constipation, urinary incontinence, nosebleeds, bradycardia, stomach upset, arrhythmia, leukopenia, elevated bilirubin, ejaculation and erectile dysfunction can occur after taking the drug. Serodosin is used to improve BPH by inhibiting alpha 1-adrenergic receptors distributed in the prostate, urethra and bladder triangle, thereby inhibiting the contractile effects of the sympathetic nervous system on smooth muscle and reducing intraurethral pressure. Taking the drug with a meal reduces the chances of side effects. The drug may increase its concentration when combined with cyclosporine, strong cytochrome P450 3A4 inhibitors such as ketoconazole and clarithromycin. It is contraindicated in those who are taking strong cytochrome P450 3A4 inhibitors; patients with severe renal impairment with CCr <30 mL/min; female patients; hypersensitivity to the drug; and children. If you need to use the drug, please strictly follow the instructions of the doctor under the guidance of the medication, do not self-medication.