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compositionComposition:TETRACYCLINE-500MG
prescription
Prescription Medicine
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Tetrastar 500mg Capsule is used to treat bacterial infections. It is also used to treat sexually transmitted diseases, such as syphilis, gonorrhoea, or chlamydia. It contains Tetracycline, which inhibits bacterial growth. It may cause common side effects such as nausea, vomiting, diarrhoea, loss of appetite, mouth sores, black hairy tongue, sore throat, dizziness, headache, and rectal discomfort. Before taking this medicine, you should tell your doctor if you are allergic to any of its components or if you are pregnant/breastfeeding, and about all the medications you are taking and pre-existing medical conditions.

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Written By Veda Maddala , M Pharmacy
Reviewed By Dr Aneela Siddabathuni , MPharma., PhD
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More about the Product

Composition :

TETRACYCLINE-500MG

Manufacturer/Marketer :

Cadila Pharmaceuticals Ltd

Consume Type :

Oral

Expires on or after :

Dec-28

Return Policy :

Not Returnable

About Tetrastar 500mg Capsule

Tetrastar 500mg Capsule is an oral antibiotic used to treat a wide variety of bacterial infections, such as respiratory tract infections, urinary tract infections, and severe acne. It works by stopping the growth of bacteria, helping your body clear the infection. Your doctor may prescribe this medicine to treat specific skin, eye, or lymphatic system infections.

To get the best results, you must take Tetrastar 500mg Capsule consistently at evenly spaced times throughout the day and complete the full course prescribed by your doctor. It is highly recommended to take this medicine on an empty stomach, either one hour before or two hours after meals, with a full glass of water. Staying well-hydrated and protecting your skin from the sun can greatly improve your comfort while on this treatment.

While taking this medicine, you might experience mild side effects like a mild upset stomach, nausea, or increased sensitivity to sunlight. If you experience severe headaches, vision changes, or intense watery diarrhoea, you must contact your doctor immediately.

Before starting Tetrastar 500mg Capsule, let your doctor know if you have liver or kidney problems. Do not take this if you are pregnant, breastfeeding, or planning a pregnancy, as it can harm the developing baby. This medicine is also not suitable for children under eight years old because it can cause permanent tooth staining.

Certain medicines like antacids, iron supplements, and dairy products can stop your body from absorbing Tetrastar 500mg Capsule properly. Avoid drinking alcohol during your treatment, as it can increase the risk of liver strain. If you are an older adult or are managing multiple health conditions, talk to your doctor or pharmacist to ensure this medicine is safe for your specific health needs

Uses of Tetrastar 500mg Capsule

Tetrastar 500mg Capsule is used to treat a wide variety of bacterial infections, such as respiratory tract infections, urinary tract infections, and severe acne. The detailed uses of Tetrastar 500mg Capsule are as follows:

  • Bacterial infections: Tetrastar 500mg Capsule stops the growth and spread of bacteria responsible for respiratory, urinary tract, and soft tissue infections.
  • Severe acne: It helps reduce the number of acne-causing bacteria on the skin and lowers inflammation.
  • Certain sexually transmitted infections: It treats infections like chlamydia and syphilis in patients who cannot take other first-line antibiotics.
  • Specific animal-borne or tick-borne infections: It is used to treat conditions like Rocky Mountain spotted fever, Lyme disease, and cholera by targeting the specific bacteria causing them.

Key Benefits

Tetrastar 500mg Capsule helps treat bacterial infections by eliminating infection-causing bacteria and supporting the body's natural recovery process. By controlling the underlying infection, it helps relieve symptoms and promotes faster healing.

  • Helps Treat Bacterial Infections Effectively: By stopping the growth of bacteria, Tetrastar 500mg Capsule helps clear a wide range of bacterial infections and supports a quicker recovery.
  • Relieves Infection-Related Symptoms: As the infection improves, Tetrastar 500mg Capsule helps reduce symptoms such as redness, swelling, fever, pain, fatigue, and, in acne, inflammatory breakouts, promoting greater comfort and healthier skin.
  • Supports Faster Recovery and Prevents Complications: By eliminating the underlying bacterial infection, Tetrastar 500mg Capsule helps prevent the infection from worsening or spreading to other parts of the body, supporting better long-term health.

Directions for Use

  • Tetrastar 500mg Capsule can be taken with or without food or as advised by your doctor. Do not take Tetrastar 500mg Capsule immediately before bed.
  • Follow your doctor's instructions on the dosage and timing of this medication.
  • Swallow Tetrastar 500mg Capsule as a whole with a glass of water.
  • Do not crush, break, or chew it.

How Tetrastar 500mg Capsule Works

Tetrastar 500mg Capsule belongs to a group of medicines known as tetracycline antibiotics. It works by interfering with the ability of bacteria to produce essential proteins that they need to grow and multiply. Without these proteins, the bacteria cannot survive or replicate. Once the bacteria are weakened and prevented from multiplying, your body's natural immune system can easily target, attack, and destroy the remaining germs. Because it stops bacterial growth rather than killing them instantly, completing the full course of treatment is essential to ensure every last bacterium is cleared.
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Alcohol

Unsafe

Avoid taking alcohol while using Tetrastar 500mg Capsule since it may worsen the side effects.

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Pregnancy

Unsafe

Tetrastar 500mg Capsule is not recommended during pregnancy due to its harmful effects on the baby, including toxic effects on skeletal formation. Please consult your doctor before taking Tetrastar 500mg Capsule if you are pregnant or planning to conceive.

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Breast Feeding

Consult your doctor

Tetrastar 500mg Capsule is excreted into breast milk in small amounts. Please consult your doctor before taking Tetrastar 500mg Capsule if you are breastfeeding.

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Driving

Unsafe

You may experience dizziness as one of the side effects of Tetrastar 500mg Capsule. In such cases, do not drive or operate machinery until you feel better.

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Liver

Consult your doctor

Let your doctor know if you have any history of liver disease before taking Tetrastar 500mg Capsule.

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Kidney

Consult your doctor

Let your doctor know if you have any history of kidney disease before taking Tetrastar 500mg Capsule.

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Children

Unsafe

Tetrastar 500mg Capsule can cause permanent yellowing or grey colouring of the teeth in children younger than eight years old.

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Heart

Consult your doctor

Please inform your doctor if you have heart problems before taking Tetrastar 500mg Capsule, as there is limited information available on its safety in such cases.

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Geriatrics

Caution

Tetrastar 500mg Capsule should be used under caution in geriatric patients. Please consult your physician.

What if I have taken an overdose of Tetrastar 500mg Capsule

If you suspect an accidental overdose, seek immediate medical attention. Symptoms of an overdose may include severe nausea, vomiting, or dizziness.

Diet & Lifestyle Advise

  • Avoid consuming dairy products, calcium-fortified juices, or calcium supplements at the same time as your medication, as they can prevent your body from absorbing the medicine. Wait at least 2 hours after your dose before consuming these.
  • Apply a broad-spectrum sunscreen with high SPF and wear protective clothing when outdoors, as this medication makes your skin highly sensitive to sunburn.
  • Drink plenty of fluids throughout the day to help prevent irritation or ulcers in your oesophagus (throat).
  • Avoid taking mineral supplements containing iron, zinc, magnesium, or aluminium close to your dose time, as they bind to the medication and render it less effective.
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Have a query?

How Soon It Starts Working

The time required for Tetrastar 500mg Capsule to start to work: The time required for Tetrastar 500mg Capsule to show its action is not clinically established. The time for which the effects of Tetrastar 500mg Capsule last: The duration of action for Tetrastar 500mg Capsule is not clinically established.

What if you forget to take Tetrastar 500mg Capsule

If you miss a dose, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and continue with your regular schedule. Do not take a double dose to make up for a missed one.

Storage

•Store Tetrastar 500mg Capsule at room temperature, safely between 20°C and 25°C (68°F to 77°F). •Keep the medicine in its original container, tightly closed, to protect it from light and moisture.

Drug Warnings

  • Do not lie down for at least 30 minutes after swallowing your dose to prevent throat irritation and swallowing difficulties.
  • Check the expiration date before use; taking an expired Tetrastar 500mg Capsule can lead to a dangerous kidney disorder.
  • If you are taking hormonal birth control pills, talk to your doctor, as this medication may temporarily make your birth control less reliable.
  • Wear sunglasses and limit your exposure to artificial UV light (such as tanning beds) while on this treatment.
  • Do not share this medicine with anyone else, even if they have similar symptoms.

Drug-Drug Interactions

verifiedApollotooltip
  • Retinoids (like isotretinoin): Combining these can significantly increase pressure inside the skull, leading to severe headaches and vision issues.
  • Anticoagulants (blood thinners like warfarin): This medicine may increase the effects of blood thinners, raising the risk of bleeding.
  • Penicillin antibiotics: Taking these together may reduce the effectiveness of penicillin.
  • Antacids and mineral supplements: Products containing aluminium, magnesium, calcium, iron, or zinc will bind with Tetrastar 500mg Capsule in your stomach, preventing its absorption.
TetracyclineAcitretin
Critical
TetracyclineTretinoin
Critical

Drug-Drug Interactions

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TetracyclineAcitretin
Critical
How does the drug interact with Tetrastar 500mg Capsule:
Coadministration of Acitretin with Tetrastar 500mg Capsule can increase the risk and severity of pseudotumor cerebri (caused by increased pressure in the brain).

How to manage the interaction:
Taking Acitretin with Tetrastar 500mg Capsule together is generally avoided as it can result in an interaction, it can be taken if your doctor has advised it. However, if you experience headaches, nausea, vomiting, and visual disturbances, contact a doctor immediately. Do not discontinue any medications without consulting a doctor.
TetracyclineTretinoin
Critical
How does the drug interact with Tetrastar 500mg Capsule:
Coadministration of Tretinoin with Tetrastar 500mg Capsule can increase the risk of pseudotumor cerebri(caused by increased pressure in the brain).

How to manage the interaction:
Taking Tretinoin with Tetrastar 500mg Capsule is not recommended, but can be taken together if prescribed by a doctor. However, if you experience headache, nausea, vomiting, and visual disturbances contact your doctor immediately. Do not discontinue any medications without consulting a doctor.
TetracyclineMagnesium carbonate
Severe
How does the drug interact with Tetrastar 500mg Capsule:
Taking Tetrastar 500mg Capsule with Magnesium carbonate may reduce the blood levels and effectiveness of Tetrastar 500mg Capsule.

How to manage the interaction:
Although taking Tetrastar 500mg Capsule and magnesium carbonate together can possibly result in an interaction, it can be taken if a doctor has prescribed it. However, if you experience any unusual symptoms contact your doctor immediately. Do not stop using any medications without first talking to your doctor.

Drug-Food Interactions

verifiedApollotooltip
  • Dairy products: Foods like milk, cheese, yoghurt, and ice cream block the absorption of Tetrastar 500mg Capsule, making the antibiotic less effective.
No Drug - Food interactions found in our database. Some may be unknown. Consult your doctor for what to avoid during medication.

Drug-Food Interactions

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All Substitutes & Brand Comparisons

Habit Forming

No

Therapeutic Class

[ANTIBIOTICS]

FAQs

Tetrastar 500mg Capsule is used to treat bacterial infections. It is also used to treat sexually transmitted diseases, such as syphilis, gonorrhoea, or chlamydia.
The Tetrastar 500mg Capsule contains Tetracycline, a broad-spectrum antibiotic effective against various bacteria, including gram-positive and gram-negative. It works by preventing the protein synthesis process required for the survival or growth of the bacteria. As a result, it prevents bacterial growth and stops the spread of the infection.
A Tetrastar 500mg Capsule should be used with proper caution and doctor consultation if you have any liver or kidney disease, gastrointestinal diseases (colitis, an inflammation of the colon), swallowing problems, and oesophagus diseases like hiatal hernia (stomach pushes through the diaphragm into the chest cavity), myasthenia gravis (muscle weakness), and reflux.
Tetrastar 500mg Capsule can affect live vaccines like typhoid vaccine and decrease their effectiveness. Please consult a doctor before you start Tetrastar 500mg Capsule if you are undergoing any vaccinations.
Take this medication 2-3 hours before or after taking iron supplements, multivitamins, calcium supplements, antacids, and laxatives since these products prevent the absorption of Tetrastar 500mg Capsule. It is also advised to avoid dairy products like milk, yoghurt, and calcium-enriched juice.
Tetrastar 500mg Capsule may induce photosensitivity and makes your skin more sensitive to the sun. Hence it is advised to use sunscreen and wear protective clothing while using Tetrastar 500mg Capsule. It is also recommended to avoid tanning booths and sunlamps.
It is best to not eat food for at least 2 hours after taking Tetrastar 500mg Capsule. Consuming food may decrease the absorption of Tetrastar 500mg Capsule. However, if you notice any upset stomach while using this medication, you can take Tetrastar 500mg Capsule with food. But avoiding milk and milk products will help.
Common side effects of Tetrastar 500mg Capsule include nausea, vomiting, diarrhoea, loss of appetite, mouth sores, black hairy tongue, sore throat, dizziness, headache, and rectal discomfort. If any of these effects persist or worsen, seek medical advice promptly.
No, you should not take Tetrastar 500mg Capsule with milk or any other dairy products. Calcium binds to the medicine and prevents your body from absorbing it properly, which makes the antibiotic less effective. Wait at least 2 hours after taking your dose before consuming dairy. Talk to your doctor or pharmacist if you need help planning your meals.
This medicine makes your skin highly sensitive to sunlight. To protect yourself, apply a high-SPF sunscreen, wear protective clothing, and avoid prolonged outdoor exposure or tanning beds. If you develop a severe sunburn or skin rash, talk to your doctor.
This medicine can cause permanent tooth discolouration (yellow-grey-brown teeth) and affect bone development in children under eight years of age. For this reason, it is avoided in this age group unless no other treatment options are available. Talk to your doctor for safer alternatives.
No, you should avoid taking Tetrastar 500mg Capsule during pregnancy and breastfeeding. The medicine can cross the placenta and pass into breast milk, potentially causing permanent tooth staining and bone growth issues in the baby. Talk to your doctor about safer choices.
No, you should remain upright (sitting or standing) for at least 30 minutes after swallowing your dose. This helps the capsule slide down to your stomach quickly and prevents severe irritation or ulcers in your oesophagus. Talk to your doctor if you experience difficulty swallowing.
Some antibiotics can temporarily lower the effectiveness of oral contraceptives. While taking Tetrastar 500mg Capsule, it is highly recommended to use a backup non-hormonal birth control method, such as condoms, to prevent unplanned pregnancy. Talk to your doctor or pharmacist for guidance.
Taking expired Tetrastar 500mg Capsule is highly dangerous. As it ages, the medication can break down into harmful substances that cause a severe kidney condition. Always check the expiration date and safely discard any old medication. Talk to your doctor if you accidentally take expired pills.
No, you must complete the full course of treatment prescribed by your doctor, even if you feel completely better. Stopping early can allow the remaining bacteria to multiply, causing the infection to return and potentially become resistant to antibiotics. Talk to your doctor if you feel you cannot complete your course.

Disclaimer

While we strive to provide complete, accurate, and expert-reviewed content on our 'Platform', we make no warranties or representations and disclaim all responsibility and liability for the completeness, accuracy, or reliability of the aforementioned content. The content on our platform is for informative purposes only, and may not cover all clinical/non-clinical aspects. Reliance on any information and subsequent action or inaction is solely at the user's risk, and we do not assume any responsibility for the same. The content on the Platform should not be considered or used as a substitute for professional and qualified medical advice. Please consult your doctor for any query pertaining to medicines, tests and/or diseases, as we support, and do not replace the doctor-patient relationship.

Reference

  1. Drugs.com Clinical Review Team. Tetracycline Clinical Drug Monograph. Auckland, NZ: Drugs.com; 2026. [Accessed on 02 Jun. 2026]Check here
  2. Tetracycline 250mg Tablets - Summary of Product Characteristics (SmPC) - (emc) [Internet]. Medicines.org.uk. 2025 [Accessed on 30 Dec 2025]Check here
  3. Tetracycline [Internet]. Ncbi.nlm.nih.gov. 2025 [Accessed on 10th July 2025]Check here
  4. Tetracycline 250mg Tablets - Patient Information Leaflet (PIL) - (emc) [Internet]. Medicines.org.uk. 2025 [Accessed on 30 Dec 2025]Check here
  5. Grossman TH. Tetracycline Antibiotics and Resistance. NIH National Library of Medicine, National Center for Biotechnology Information. PubMed Central. April 2016. [Accessed on 10th November 2021]Check here
  6. Accord. Electronic Medicines Compendium (EMC) [Revised in November 2020] [Accessed on 10th November 2021]Check here

Manufacturer/Marketer address

Troikaa Pharmaceuticals Ltd., Registered Office: , 'Commerce House - 1', Satya Marg, Bodakdev, Ahmedabad-380 054. Gujarat, India.
Other Info - TE27154
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