Alpha-1 blockers
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| Drug monograph · NCLEX study reference | |
| Trade names | Flomax |
|---|---|
| Therapeutic class | Benign prostatic hyperplasia agent, antihypertensive (some) |
| Pharmacologic class | Alpha-1 adrenergic blockers |
| Onset / peak / duration | Symptom improvement over days to weeks; once daily. |
| Half-life / level | Tamsulosin about 9 to 15 hours; no routine level. |
| Routes | PO (oral) |
| High-alert (ISMP) | No |
| Black box warning | None |
| Antidote / reversal | Supportive care. |
| Pregnancy / lactation | Not typically used (male indication). |
Nursing pharmacology study reference (NCLEX-style monograph). Numeric values are standard teaching ranges for study and must be verified against current manufacturer labeling before clinical use. This is educational content, not prescribing guidance.
Alpha-1 blockers (brand name Flomax) — Benign prostatic hyperplasia agent, antihypertensive (some); Alpha-1 adrenergic blockers.
Identification
- Therapeutic class: Benign prostatic hyperplasia agent, antihypertensive (some).
- Pharmacologic class: Alpha-1 adrenergic blockers.
Pharmacology
- Mechanism of action: Relax smooth muscle in the prostate and bladder neck to improve urine flow; doxazosin and prazosin also lower blood pressure.
- Onset / peak / duration: Symptom improvement over days to weeks; once daily.
- Half-life / therapeutic level: Tamsulosin about 9 to 15 hours; no routine level.
Clinical use
- Indications: Benign prostatic hyperplasia symptoms; doxazosin and prazosin also hypertension; prazosin off-label for PTSD nightmares.
- Usual dose, route, frequency: Tamsulosin PO once daily after the same meal; others once daily.
- Maximum dose / adjustments: Titrate antihypertensive alpha blockers slowly.
Safety
- Contraindications: Hypersensitivity; caution before cataract surgery.
- Black box warning: None.
- Interactions: PDE-5 inhibitors and antihypertensives (additive hypotension), strong CYP3A4 inhibitors (tamsulosin).
- Pregnancy / lactation: Not typically used (male indication).
- High-alert: No.
Adverse effects
- Common side effects: Orthostatic hypotension, dizziness, retrograde ejaculation, nasal congestion.
- Serious effects to report: First-dose syncope, intraoperative floppy iris syndrome during cataract surgery, priapism (rare).
- Antidote / reversal: Supportive care.
Nursing process
- Assessment before administration: Blood pressure (lying and standing), urinary symptoms, upcoming eye surgery.
- Interventions during therapy: Give the first dose at bedtime (first-dose effect); rise slowly.
- Monitor: Blood pressure, urinary flow, dizziness.
- Evaluation / expected outcome: Improved urinary flow with tolerable blood pressure.
Patient teaching
- Patient teaching: Rise slowly to avoid dizziness; tell your eye surgeon you take this; take tamsulosin after the same meal each day.
- Notify provider if: Fainting, persistent dizziness, prolonged erection.
- Administration tips: Tamsulosin 30 minutes after the same meal; first dose at bedtime.