Prescription requiredThyroid hormone replacement

Lethyrox 12.5 — Uses, Dosage & Benefits

Lethyrox 12.5 is used for Hypothyroidism (underactive thyroid), thyroid hormone replacement after thyroidectomy, goitre/thyroid suppression therapy as advised by doctor.

Medically reviewed by Dr. Balaji Krishnan, MBBS · Updated August 2026

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Active Ingredient / Composition

Levothyroxine sodium 12.5 mcg tablet

What is Lethyrox 12.5 used for?

Hypothyroidism (underactive thyroid)
thyroid hormone replacement after thyroidectomy
goitre/thyroid suppression therapy as advised by doctor

How Lethyrox 12.5 Works

Levothyroxine is a synthetic form of thyroxine (T4), a natural thyroid hormone. It replaces deficient thyroid hormone and is converted in the body to the active hormone (T3), helping normalize metabolism, energy, heart rate and growth.

Dosage & Directions

Oral tablet. Take exactly as prescribed, usually once daily on an empty stomach (preferably morning) 30–60 minutes before food with water. Take at the same time each day; avoid taking along with calcium/iron/antacids—keep a 4-hour gap unless advised otherwise.

Always follow your doctor's prescription. Do not self-medicate.

Key Benefits

Replaces deficient thyroid hormone
Helps normalize TSH and thyroid levels
Improves symptoms like fatigue and weight gain due to hypothyroidism
Supports normal metabolism and energy
Helps maintain normal heart rate and body temperature

Pregnancy

Generally safe (often required in pregnancy); dose adjustment and close monitoring needed—consult doctor

Alcohol Interaction

Use with caution; alcohol does not directly interact but may worsen symptoms or affect adherence—follow medical advice

Lethyrox 12.5 — Quick Facts

Composition: Levothyroxine sodium 12.5 mcg tablet
Therapeutic class: Thyroid hormone replacement
Drug class: Thyroid hormone (synthetic T4)
Prescription: Required (Rx)
Price: ₹65
Habit forming: No
Storage: Store below 25°C in a dry place, protected from light and moisture. Keep in original blister/strip and out of reach of children.

Lethyrox 12.5 — Usage FAQs

How should I take this medicine?

Follow the dosage prescribed by your doctor. Do not alter the dose without medical advice.

Can I take this medicine without a prescription?

Prescription-required medicines need a valid Rx. OTC medicines can be purchased directly.

What if I miss a dose?

Take the missed dose as soon as you remember, unless it is close to your next scheduled dose. Do not double the dose.

How long does it take to show effect?

The time to show effect varies by medicine and condition. Consult your doctor for specific timelines.

Lethyrox 12.5 — Uses, Dosage & Benefits

Active Ingredient / Composition

What is Lethyrox 12.5 used for?

How Lethyrox 12.5 Works

Dosage & Directions

Key Benefits

Pregnancy

Alcohol Interaction

Lethyrox 12.5 — Quick Facts

Lethyrox 12.5 — Usage FAQs

More from PingMeDoc™

Safety disclaimer

Lethyrox 12.5 — Uses, Dosage & Benefits

Active Ingredient / Composition

What is Lethyrox 12.5 used for?

How Lethyrox 12.5 Works

Dosage & Directions

Key Benefits

Pregnancy

Alcohol Interaction

Lethyrox 12.5 — Quick Facts

Lethyrox 12.5 — Usage FAQs

More from PingMeDoc™

Safety disclaimer