ALPHADERM
Clinical safety rating: caution
Comprehensive clinical and safety monograph for ALPHADERM (ALPHADERM).
Alpha-1 adrenergic receptor antagonist; blocks vasoconstriction and relaxes smooth muscle in blood vessels and prostate.
| Metabolism | Hepatic via cytochrome P450 (CYP3A4); active metabolites. |
| Excretion | Renal excretion of unchanged drug accounts for 60-70% of elimination; biliary/fecal excretion accounts for 20-30%; less than 10% metabolized hepatically. |
| Half-life | Terminal elimination half-life is 8-12 hours in adults with normal renal function; prolonged to 18-24 hours in moderate renal impairment (CrCl 30-50 mL/min). |
| Protein binding | Approximately 85% bound to albumin; minor binding to alpha-1-acid glycoprotein. |
| Volume of Distribution | Volume of distribution is 0.6-0.8 L/kg, indicating distribution into total body water. |
| Bioavailability | Oral bioavailability is 70-80% due to first-pass metabolism; IM bioavailability is 90-95%. |
| Onset of Action | Oral: 30-60 minutes; Intravenous: within 5 minutes; Intramuscular: 15-30 minutes. |
| Duration of Action | Duration of clinical effect is 6-8 hours for oral and IM; 4-6 hours for IV due to rapid redistribution. |
Topical: Apply a thin film to affected areas once daily. Not for ophthalmic, oral, or intravaginal use.
| Dosage form | CREAM |
| Renal impairment | No dose adjustment required for renal impairment. |
| Liver impairment | No dose adjustment required for hepatic impairment. |
| Pediatric use | Safety and efficacy in pediatric patients have not been established. |
| Geriatric use | No specific dose adjustment; use with caution due to potential increased skin fragility. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for ALPHADERM (ALPHADERM).
| Breastfeeding | Unknown if excreted in human milk; M/P ratio not established. Caution advised due to potential for serious adverse reactions in nursing infants. |
| Teratogenic Risk | Pregnancy Category C. First trimester: No adequate human studies; animal studies suggest embryocidal and teratogenic effects at high doses. Second/third trimester: Potential for fetal harm; avoid unless benefit outweighs risk. |
| Fetal Monitoring |
■ FDA Black Box Warning
None.
| Serious Effects |
["Hypersensitivity to alpha-blockers","History of orthostatic hypotension","Micturition syncope","Severe renal impairment","Concomitant use with PDE-5 inhibitors (e.g., sildenafil) due to risk of hypotension"]
| Precautions | ["Orthostatic hypotension and syncope, especially with first dose","May cause dizziness, drowsiness, or lightheadedness","Use caution in patients with hepatic impairment","May exacerbate angina or heart failure"] |
| Food/Dietary | No specific food interactions. However, high-fat meals may increase systemic absorption of topical tretinoin marginally; no dietary restrictions necessary. Avoid excessive vitamin A supplements to reduce risk of hypervitaminosis A. |
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| Monitor maternal blood pressure, renal function, and fetal growth via ultrasound. Assess for signs of fetal distress during third trimester. |
| Fertility Effects | Animal studies show reduced fertility and impaired reproductive function at high doses. Human data limited. |
| Clinical Pearls | ALPHADERM (tretinoin 0.05% cream) is a retinoid used for photoaging and acne. Apply a pea-sized amount to dry skin 30 minutes after cleansing; avoid concomitant use of other topical retinoids or exfoliants to prevent irritation. Initiate therapy every other night to build tolerance. Strict sun protection required: use SPF 30+ daily. May cause initial flare of acne (retinoid 'purging') lasting 2-4 weeks. Contraindicated in pregnancy (FDA Category C). |
| Patient Advice | Apply a thin layer to affected areas once daily at bedtime, 30 minutes after washing and drying face. · Avoid excessive sun exposure; use broad-spectrum sunscreen and protective clothing. · Do not use with other medicated topical products, including benzoyl peroxide or salicylic acid. · Expect mild redness, peeling, or stinging initially; this usually subsides with continued use. · Notify your doctor if you are pregnant, planning pregnancy, or breastfeeding. · Store at room temperature away from heat and light. |