Mayul (Terazosin Hydrochloride Dihydrate)

Terazosin is an alpha‑1 adrenergic blocker that acts on vascular smooth muscle and prostatic tissue to improve blood pressure control and urinary flow.

• Hypertension: lowers systemic blood pressure by causing vasodilation.
• Benign prostatic hyperplasia (BPH): reduces prostate smooth‑muscle tone, improving urinary stream.
• Urinary retention due to BPH: decreases bladder outlet resistance, facilitating bladder emptying.

• Terazosin selectively antagonizes alpha‑1 adrenergic receptors located on vascular smooth muscle and in the prostate and bladder neck. Blocking these receptors prevents norepinephrine‑mediated contraction, leading to vasodilation, reduced peripheral resistance, and relaxation of prostatic smooth muscle, which together lower blood pressure and improve urinary flow.

Terazosin may cause a range of adverse reactions, from mild to severe.

Common Side Effects

• Dizziness: feeling light‑headed, especially after standing.
• Headache: mild to moderate intensity.
• Fatigue: general tiredness or lack of energy.
• Nasal congestion: blocked or runny nose.
• Peripheral edema: swelling of the lower limbs.
• Nausea: upset stomach or urge to vomit.

Serious or Rare Side Effects

• Severe hypotension: marked drop in blood pressure that can cause fainting.
• Syncope: sudden loss of consciousness.
• Priapism: prolonged, painful erection requiring urgent care.
• Anaphylaxis: severe allergic reaction with breathing difficulty.
• Liver injury: signs of hepatitis such as jaundice.
• Cardiac arrhythmia: irregular heart rhythm.

Before initiating therapy with Mayul, several safety considerations should be reviewed.

• Blood pressure monitoring: check baseline and periodic readings.
• Hepatic impairment: use caution and consider dose adjustment.
• Orthostatic hypotension: advise patients to rise slowly from sitting or lying positions.
• Concomitant antihypertensives: assess risk of additive blood‑pressure lowering.
• Elderly patients: start at lower dose and titrate slowly.
• Store at ambient temperature: keep in the original pack, protect from moisture.

Terazosin can interact with several drug classes, requiring attention to avoid adverse outcomes.

Major Interactions (Avoid)

• Other alpha‑1 blockers: may cause excessive vasodilation.
• Potent CYP3A4 inhibitors (e.g., ketoconazole): increase terazosin plasma levels.
• Strong antihypertensives (e.g., nitroprusside): risk of severe hypotension.

Moderate Interactions (Monitor Closely):\n- Diuretics: may enhance orthostatic blood‑pressure drop.

• NSAIDs: can blunt antihypertensive effect.
• Phosphodiesterase‑5 inhibitors (e.g., sildenafil): may lead to pronounced hypotension.