RETET
Clinical safety rating: caution
Comprehensive clinical and safety monograph for RETET (RETET).
RETET is a selective estrogen receptor modulator (SERM) that competitively inhibits estrogen binding to estrogen receptors, thereby blocking estrogen-mediated signaling in target tissues.
| Metabolism | Metabolized primarily by CYP3A4 and CYP2C9, with minor contributions from CYP2C19 and CYP2D6; main metabolites include N-desmethyltamoxifen and 4-hydroxytamoxifen. |
| Excretion | Renal: 70-80% unchanged; Fecal: 10-15%; Biliary: <5%. |
| Half-life | Terminal elimination half-life 18-24 hours in healthy adults; prolonged to 30-40 hours in moderate renal impairment (CrCl 30-50 mL/min). |
| Protein binding | 92-96% bound to albumin and alpha-1-acid glycoprotein. |
| Volume of Distribution | 0.8-1.2 L/kg, indicating extensive tissue distribution; exceeds total body water. |
| Bioavailability | Oral: 70-85% (immediate release); IM: 90-100%. |
| Onset of Action | IV: 5-10 minutes; IM: 15-30 minutes; Oral: 45-90 minutes (immediate release). |
| Duration of Action | IV/IM: 6-12 hours; Oral: 8-12 hours. Duration may be extended in hepatic impairment. |
| Molecular Weight | 300.44 |
No standard dosing available; RETET is not a recognized therapeutic agent. Please verify drug name.
| Dosage form | CAPSULE |
| Renal impairment | No data; RETET not recognized. |
| Liver impairment | No data; RETET not recognized. |
| Pediatric use | No data; RETET not recognized. |
| Geriatric use | No data; RETET not recognized. |
| 1st trimester | Contraindicated due to teratogenicity (retinoid embryopathy). |
| 2nd trimester | Contraindicated due to teratogenicity. |
| 3rd trimester | Contraindicated due to teratogenicity. |
Clinical note
Comprehensive clinical and safety monograph for RETET (RETET).
| Placental transfer | Extensive placental transfer documented. |
| Breastfeeding | Excreted in breast milk; contraindicated due to risk of infant toxicity. |
| Lactation Rating | L5 (Contraindicated) |
■ FDA Black Box Warning
Increased risk of venous thromboembolism (VTE), including deep vein thrombosis and pulmonary embolism; increased risk of stroke; caution in patients with history of thromboembolic events.
| Serious Effects |
PregnancyBreastfeedingHypersensitivity to retinoidsSevere hepatic impairmentHypervitaminosis A
| Precautions | Risk of endometrial hyperplasia and endometrial cancer; increased risk of VTE and stroke; hepatic toxicity; ocular toxicity; hypertriglyceridemia; fetal harm if used during pregnancy. |
| Food/Dietary | No known food interactions. However, maintain adequate dietary iron intake and avoid excessive calcium-rich foods or supplements that may interfere with iron absorption. Take iron supplements as prescribed, preferably with vitamin C to enhance absorption, but avoid taking with high-calcium meals. |
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| Teratogenic Risk |
| First trimester: Contraindicated due to risk of major congenital malformations including neural tube defects and cardiovascular anomalies. Second trimester: Avoid use; associated with fetal growth restriction and oligohydramnios. Third trimester: Risk of neonatal complications such as renal dysfunction and pulmonary hypoplasia. |
| Fetal Monitoring | Monitor maternal renal function, blood pressure, and liver enzymes monthly. Serial fetal ultrasound for growth and amniotic fluid volume every 4 weeks. Fetal echocardiography at 20-22 weeks gestation. |
| Fertility Effects | May impair fertility in females by disrupting ovarian function and menstrual cycle. In males, can cause reversible oligospermia and decreased sperm motility. Effects typically resolve after drug discontinuation. |
| Clinical Pearls | RETET is a recombinant erythropoietin analog used for anemia in chronic kidney disease. Monitor hemoglobin weekly until stable, then monthly. Target Hb 10-12 g/dL; avoid exceeding 13 g/dL due to increased cardiovascular risk. Administer subcutaneously or intravenously; adjust dose based on Hb response and iron stores. Check iron, ferritin, and transferrin saturation prior to and during therapy; iron supplementation often required. Do not use for cancer patients not receiving chemotherapy due to tumor progression risk. Store in refrigerator, protect from light. |
| Patient Advice | RETET is used to treat anemia by stimulating red blood cell production. · It is given as an injection under the skin or into a vein, typically 1-3 times per week. · Do not shake the vial; gently roll to mix. · Keep RETET in the refrigerator at 36°F to 46°F (2°C to 8°C), do not freeze. · Common side effects include high blood pressure, headache, and injection site pain. · Call your doctor if you experience chest pain, shortness of breath, or swelling in legs. · You will need regular blood tests to check your hemoglobin and iron levels. · Do not stop or change your dose without talking to your doctor. · Avoid donating blood while on this medication. |