Letrol Tablet 2.5 mg (1 Strip=5 Pieces)
Original price was: 210.00৳ .199.50৳ Current price is: 199.50৳ .
Indications
Adjuvant treatment of postmenopausal women with early breast cancer (positive or unknown oestrogen or progesterone receptor status) who have received 5 years of adjuvant tamoxifen therapy (extended adjuvant therapy).
First-line treatment in postmenopausal women with hormone-dependent advanced breast cancer.
Treatment of advanced breast cancer in women with natural or artificially induced postmenopausal status, who have previously been treated with antioestrogens.
Pre-operative therapy in postmenopausal women with localized hormone receptor positive breast cancer, to allow subsequent breast-conserving surgery in women not originally considered candidates for this type of surgery. Subsequent treatment after surgery should be in accordance with standard of care.
Pharmacology
In healthy postmenopausal women, single doses of 0.1, 0.5 and 2.5mg letrozole suppress serum oestrone and oestradiol by 75-78% and 78% from baseline respectively. Maximum suppression is achieved in 48-78 hours. In post-menopausal patients, with advanced breast cancer, daily doses of 0.1 to 5mg suppress plasma concentration of oestradiol, oestrone, and oestrone sulphate by 78-95% from baseline in all patients treated. Letrozole had no effect on plasma androgen concentrations (androstenedione and testosterone) among healthy postmenopausal women after single doses of 0.1, 0.5 and 2.5mg indicating that the blockade of estrogen biosynthesis does not lead to accumulation of androgenic precursors. Impairment of adrenal steroidogenesis has not been observed.
Pharmacokinetics: Letrozole is rapidly and completely absorbed from the gastrointestinal tract (absolute bioavailability 99.9%). Food slightly decreases the rate of absorption, but the extent of absorption remains unchanged. The minor effect of the absorption rate is not considered to be of clinical relevance and therefore letrozole may be taken after, with or before food. Plasma protein binding of letrozole is approximately 60%, mainly to albumin (55%). The concentration of letrozole in erythrocytes is about 80% of that in plasma. Metabolic clearance to a pharmacologically inactive carbinol metabolite is the major elimination pathway of letrozole but is relatively slow when compared to hepatic blood flow. The cytochrome P450 isoenzymes 3A4 and 2A6 were found to be capable of converting letrozole to this metabolite in vitro but their individual contributions to letrozole metabolism in vivo have not been established. The apparent terminal elimination half-life in plasma is about 2 days. After daily administration of 2.5mg of letrozole, steady-state levels are reached within 2 to 6 weeks.
Dosage & Administration
Patients with hepatic and/or renal impairment: No dosage adjustment is required for patients with hepatic impairment or renal impairment (creatinine clearance =10 mL/min). However, patients with severe hepatic impairment (Child-Pugh score C) should be kept under close supervision.
Children: Not applicable.
Interaction
Contraindications
Side Effects
Rare: Nervous disorders such as anxiety, nervousness, irritability, drowsiness, memory problems, Somnolence, insomnia, Pain or burning sensation in the hands or wrist (carpal tunnel syndrome) Impairment of sensation, especially that of touch ,Eye disorders such as blurred vision, eye irritation ,Skin disorders such as itching (urticarial). Vaginal discharge or dryness Dryness of mucous membranes, Weight decrease, Urinary tract infection, increased frequency of urination, Cough, Increased level of enzymes, yellowing of the skin and eyes, High blood levels of bilirubin (a breakdown product of red blood cells)
