Doxycycline: Uses, How It Works, Medicines
Doxycycline is a tetracycline antibiotic used to treat certain bacterial infections. These include some chest, urinary tract, gum and sexually transmitted infections. It works only against bacteria, so it does not help colds, flu or other viral infections. It can make skin sensitive to the sun and is usually avoided in pregnancy and in young children, and in India it is a prescription medicine.
Also known as: Doxycycline tablet, Doxycycline 100 mg, Doxycycline hyclate, Doxycycline monohydrate, Doxycycline IP, Tetracycline antibiotic
Pharmacist review in progress. This page is based on the sources listed below and is being checked by our registered pharmacist.
How does Doxycycline work?
Doxycycline attaches to the small (30S) part of the bacterial ribosome, the machinery bacteria use to build proteins. Without new proteins the bacteria cannot grow or multiply, and the body's defences clear the infection.
How to take Doxycycline
Take Doxycycline exactly as your doctor has prescribed or as printed on the pack. Your doctor decides the dose and the number of days, which depend on the infection. The first-day dose is sometimes higher.
Side effects of Doxycycline
Most people take doxycycline without serious problems. Headache, feeling sick and a rash are common side effects, but a few side effects need medical help.
Uncommon or mild
- Feeling sick (nausea) or being sick (vomiting)
- Headache
- Rash
- Diarrhoea or loss of appetite
- Sore throat or discomfort when swallowing
Rare but serious: get medical help
- Signs of a severe allergic reaction: swelling of the face, lips, tongue or throat, difficulty breathing, hives or collapse. Get emergency help straight away
- Skin that burns or reacts strongly in sunlight, with rash, itching or redness
- Pain or difficulty swallowing, or chest pain after taking the tablet (possible food pipe irritation or ulcer)
- Severe or watery diarrhoea, or diarrhoea with blood, which can be a sign of a gut infection called C. difficile, even weeks after the course
- A severe headache with blurred vision, which can be a sign of raised pressure around the brain
- A severe skin reaction, such as blistering or peeling skin
- Tiredness, easy bruising or frequent infections (possible blood changes), or yellow skin or eyes
Who should be careful
Doxycycline is not suitable for everyone. Tell your doctor about your health and your other medicines before taking it.
When the label says not to use it
- Allergy to doxycycline or any other tetracycline antibiotic
- A serious allergic reaction to any ingredient of the tablet
- It treats bacterial infections only. It does not work for colds, flu or other viral infections, and taking it when it is not needed adds to antibiotic resistance
- Pregnancy: it is usually avoided because it can affect the baby's teeth and bones; tell your doctor if you are pregnant or planning a pregnancy. Breastfeeding: ask your doctor
- Children: it is usually not given to young children because it can leave lasting stains on developing teeth; your doctor decides
- Allergy to doxycycline or any other tetracycline antibiotic such as minocycline
- Sunlight: it can make skin burn easily, so cover up, use sunscreen and avoid sunbeds
- Liver or kidney disease, lupus, or myasthenia gravis: tell your doctor
- Alcohol dependence or heavy drinking: it can lower doxycycline levels
- A history of food pipe problems or trouble swallowing
- Acne treatment with isotretinoin or other retinoids: the combination is avoided
Medicines and things that interact with Doxycycline
Some medicines and supplements change how doxycycline is absorbed or how long it works. Tell your doctor or pharmacist about everything you take.
- Antacids with aluminium, calcium or magnesium, bismuth, iron, zinc and multivitamins with minerals: they reduce absorption, so keep them well apart from doxycycline as your pharmacist advises
- Isotretinoin and other vitamin A related acne medicines: the combination can raise pressure around the brain and is avoided
- Warfarin and other blood thinners: the blood-thinning effect may increase, so your doctor may check your clotting more often
- Penicillin antibiotics: avoid taking them together unless your doctor has prescribed both
- Oral contraceptives: their effect may be reduced; ask your doctor about extra protection
- Carbamazepine, phenytoin and barbiturates: they shorten how long doxycycline stays in the body
- Alcohol: can stop doxycycline from working properly
If someone takes too much
Taking one extra tablet by mistake is unlikely to be serious, but larger amounts can cause sickness and vomiting. If someone has taken much more than prescribed, call 112 or go to the nearest hospital and take the medicine pack with you.
Regulatory status in India
Approved for sale in India as a prescription medicine. Single-ingredient doxycycline is not on the CDSCO list of medicines banned under section 26A of the Drugs and Cosmetics Act. Several fixed-dose combinations that include doxycycline are prohibited (for example with serratiopeptidase, with neomycin, or in a kit with serratiopeptidase and diclofenac), so check the ingredient list on the pack.
Type of medicine
Doxycycline belongs to this type of medicine.
Medicines that contain Doxycycline
These medicines sold in India contain Doxycycline. They are listed A to Z, not ranked.
- Doxt-SL 100 · 100 mg tablet
What is Doxycycline used for?
Medicines that contain Doxycycline are used for these conditions.
Common questions
Is Doxycycline a prescription medicine?
Yes. Doxycycline is a prescription-only antibiotic in India. It should be taken only if a doctor has prescribed it, and it should not be started, stopped or changed without the doctor's advice.
Is Doxycycline an antibiotic for cold, flu or viral fever?
No. Doxycycline acts only on bacteria, and colds, flu and many fevers are caused by viruses. Taking it for them does not speed recovery, adds side effects and adds to antibiotic resistance. A doctor decides whether an infection is bacterial and needs an antibiotic.
How should Doxycycline be taken?
Swallow it with a full glass of water while sitting or standing, and stay upright for at least 30 minutes, to avoid irritating the food pipe. Keep it apart from antacids, iron and zinc. If the pack says dispersible tablet, follow its instructions. Follow the label or your doctor's advice.
Should I finish the whole course of Doxycycline?
Take the full course your doctor prescribed, even if you feel better sooner, because stopping early can let the infection come back. The exception is a serious side effect or allergic reaction: stop and contact your doctor straight away. Never keep leftover tablets or share them.
Can I go out in the sun while taking Doxycycline?
Take care. Doxycycline can make skin burn easily, causing rash, itching or redness. Cover your skin, wear a hat, use a high-factor sunscreen and avoid sunbeds. On brown or black skin the reaction can be harder to see. Tell your doctor if your skin reacts.
Can Doxycycline be taken in pregnancy, by children or while breastfeeding?
It is usually avoided in pregnancy and in young children because it can stain developing teeth and affect bone growth, and ask your doctor about breastfeeding. A doctor may still prescribe it if the benefit outweighs the risk. Tell your doctor if you are pregnant or may be.
Can I drink alcohol while taking Doxycycline?
Alcohol can stop doxycycline working properly, especially with heavy drinking, so it is best avoided during the course. Ask your doctor or pharmacist if you are unsure.
Sources
- Doxycycline hyclate tablets and capsules: prescribing information (DailyMed label revised 4/2025). DailyMed, US National Library of Medicine
- Doxycycline. NHS (UK)
- Side effects of doxycycline. NHS (UK)
- ATC/DDD Index: J01AA Tetracyclines. WHO Collaborating Centre for Drug Statistics Methodology
- List of drugs prohibited for manufacture and sale through gazette notifications under section 26A of the Drugs & Cosmetics Act 1940. Central Drugs Standard Control Organisation (CDSCO)
- The Drugs Rules, 1945 (consolidated, September 2024 edition), Schedule H: prescription drugs. Central Drugs Standard Control Organisation (CDSCO)