tamsulosin, a selective adrenergic receptor antagonist. ▪ INDICATIONS: This drug is used to treat symptoms of benign prostatic hyperplasia. ▪ CONTRAINDICATIONS: Known hypersensitivity to this drug prohibits its use. ▪ ADVERSE EFFECTS: Adverse effects of this drug include asthenia, insomnia, chest pain, amblyopia, floppy iris syndrome, nausea, diarrhea, dysgeusia, decreased libido, abnormal ejaculation, back pain, rhinitis, pharyngitis, and cough. Common side effects include dizziness and headache.