🗂️ Pocket Fact‑Sheet — Eltroxin® 100 mcg Tablet

📌 Item	🔍 Detail
API Strength	Levothyroxine sodium 100 mcg (T4)
Therapeutic Class	Thyroid hormone replacement
Typical Indications	Primary hypothyroidism ▪ Post‑thyroidectomy TSH suppression ▪ Hashimoto maintenance
Indian Brand	Eltroxin® 100 mcg
Manufacturer	GlaxoSmithKline Pharmaceuticals Ltd., Mumbai 🇮🇳 (founded 1924)
Pack Style	100 scored tablets in HDPE bottle* or 10‑tablet Alu‑Alu strip* (*market variants)
Ship Lead	6 – 15 days worldwide ✈️

“Getting TSH into goal range is 80 % patient adherence, 20 % dose math—Eltroxin’s micro‑gram accuracy keeps the numbers honest.” — Dr Neha Dhall, DM Endocrinology, Chandigarh

🎦 Video Sprint

Watch: Timing Your Levothyroxine for Peak Absorption (3 m 40 s)

Fresh‑Cut Introduction

Hypothyroid fatigue, unexplained weight gain, sluggish bowels—millions feel them, yet the solution often rests on a 100 µg pastel‑yellow Eltroxin tablet taken at dawn. GlaxoSmithKline’s Indian line micro‑grinds thyroxine to < 10 µm, coats it with hydrogenated castor oil for moisture shield, and prices each pill at ₹2.6 (~$0.03)—one of the world’s most budget‑friendly levothyroxine options. With a narrow therapeutic index drug, batch consistency matters; GSK’s lot‑to‑lot potency variance sits <= ±3 % per US‑FDA bioequivalence tests.

Why Buyers Choose Eltroxin

Micro‑Dosing Flex: Scored tablet splits to 50 µg—handy for titration.
Stable Supply Chain: GSK has produced Eltroxin since the 1960s; Indian plant holds WHO‑GMP + MHRA nod.
Wallet Ease: Yearly 100 µg supply (365 tabs) costs ≈ $11—beats North‑American generics by 70 %.

How Thyroxine Tunes Metabolism

Levothyroxine (T4) converts to active T3 via de‑iodinase II in liver & muscle, binding nuclear TRα/β → up‑regulates Na⁺/K⁺ ATPase, mitochondrial enzymes, and LDL receptors—chasing away cold intolerance & dyslipidaemia.

Latest Evidence Corner

Study Tag	Cohort	Dose tweak (100 µg base)	TSH Goal (< 2.5 mIU/L)	Highlight
DAWN‑FAST 2024	580 primary hypo	AM empty stomach	82 %	Coffee 30 min later OK
BEDTIME‑T4 2023	360 stable pts	100 µg HS vs AM	TSH same; FT4 +15 %	Non‑inferior, better compliance
PREG‑TIGHT 2025	220 pregnant hypo	+12.5 µg each tri	90 % TSH 0.3–2.0	No birth defects, vit D balanced

Dosing Cheat‑Table

Scenario	Starting µg/kg	Example 70 kg	Note
Healthy < 60 y	1.6	112 µg (split 100+12.5)	Use 25/50 tabs to top‑up
> 60 y / CAD	0.9	62.5 µg	Escalate q4‑6 wk
Pregnant	Baseline + 25 %	From 100 → 125 µg	Check TSH monthly
TSH‑suppress DTC	2.2	150 µg	Aim TSH < 0.1 mIU/L

Absorption Hacks: Take on fasting stomach with 200 mL water; wait 30 min before food, 4 h from Ca/Fe supplements.

Safety & Interactions Board

Alert	Frequency	Mitigation
Palpitations	3 %	β‑block low dose until TSH in range
Weight loss > 2 kg/mo	2 %	Re‑check TSH, lower 12.5 µg
Osteopenia long‑term	0.5 %	Dexa q2 y if post‑meno
Drug binders	cholestyramine	Dose T4 4 h earlier

Wallet & Customs Snapshot

Region	100 tabs*	Import Cue
🇺🇸 USA	$11	HS 30043999; ≤360 tabs
🇬🇧 UK	£9.20	CN22; GP script; VAT‑free < £39
🇦🇺 AU	A$19	TGA personal‑import
🇪🇺 EU	€10.50	Declare personal therapy
*Q2 2025 exporter rms.