Revised: 11 June 2015

Information for Consumers

Consumer Medicine Information


Doxycycline 50 mg and 100 mg tablets

What is in this leaflet

This leaflet answers some common questions about DOXY tablets. It does not contain all the available information.

It does not take the place of talking to your doctor and pharmacist.

All medicines have risks and benefits. Your doctor weighed the risks of you taking DOXY tablets against the benefits this medicine is expected to have for you.

If you have any concerns about taking this medicine, ask your doctor or pharmacist.

Keep this leaflet with the medicine. You may need to read it again.

What DOXY tablets are used for

Doxycycline is a broad spectrum antibiotic. This means it can be used to treat a wide range of organisms.

Doxycycline belongs to a class of medicines called tetracyclines . These medicines work by killing or stopping the growth of bacteria which cause infection. They also work against parasites.

It is used to treat infections of the:

  • chest
  • urethra
  • womb
  • rectum

DOXY tablets may be used to aid medicines such as amoebicides (used to treat parasites).

DOXY tablets may also be used to treat severe acne.

DOXY tablets are only used to treat infections that will respond to it. Some infections are resistant to the effects of doxycycline.

Your doctor may have prescribed DOXY tablets for another reason.

Ask your doctor if you have any questions about why DOXY tablets have been prescribed for you.

This medicine is available only with a doctor's prescription.

Before you take DOXY tablets

When you must not take it

Do not take DOXY tablets if you have had an allergy to:

  • doxycycline
  • other tetracycline antibiotics
  • any of the ingredients listed at the end of this leaflet

Symptoms of an allergic reaction to DOXY tablets may include:

  • skin rash
  • difficulty breathing
  • hayfever
  • swelling

Do not take DOXY tablets if you are under 12 years of age.
DOXY tablets may cause permanent tooth discolouration if used during tooth development

Do not take DOXY tablets if you are pregnant or breastfeeding
Studies indicate tetracyclines cross the placenta and doxycycline has been found in breast milk.
Doxycycline produces toxic effects on the developing foetus and delays bone development. It may also decrease the growth rate of the leg bones in premature babies.

DOXY tablets may cause permanent tooth discolouration if used during tooth development (last half of pregnancy, infancy and in childhood to the age of 12 years). It may also cause the enamel surrounding the tooth to become defective.

Do not take DOXY tablets if the packaging is torn or shows signs of tampering or if the tablets show visible signs of deterioration.

Do not take DOXY tablets after the expiry date (EXP) printed on the pack.
If you take this medicine after the expiry date has passed, it may not work as well.

Before you start taking it

Tell your doctor or pharmacist if you are allergic to any other medicines, foods, dyes or preservatives.

Tell your doctor if you intend to become pregnant or breastfeed.
Your doctor will discuss the risks and benefits of taking this medicine during pregnancy.

Tell your doctor if you are taking drugs to thin the blood

DOXY tablets may cause photosensitivity, which results in sunburn. Treatment should be stopped at the first sign of redness. Wear protective clothing and sunscreen while taking DOXY tablets.

Use of DOXY tablets may occasionally result in overgrowth of organisms, which are resistant to it. Treatment should be stopped and an alternative antibiotic used.

DOXY tablets are unlikely to produce an effect on the ability to drive or use machinery, however, care should be taken until you know how this medicine affects you.

DOXY tablets may increase the effects of systemic lupus erythematous (lupus). A disease where the body attacks it's own cells and tissues.

There is no evidence this medicine is addictive.

Taking other medicines

Tell your doctor if you are taking any other medicines, including medicines that you buy without a prescription from your pharmacy, supermarket or health food shop. Some medicines may interfere with DOXY tablets. These include:

  • antibiotics called penicillins
  • phenytoin and barbiturates - used to treat epilepsy
  • iron preparations - including vitamin preparations which contain iron

Your doctor and pharmacist may have more information on medicines to be careful with or avoid while taking this medicine

How DOXY tablets are taken

Carefully follow all directions given to you by your doctor. Their directions may differ from the information contained in this leaflet. If you do not understand the instructions on the label, ask your doctor or pharmacist for help.

Your doctor will decide what dose of, and for how long you should take DOXY tablets. This depends on your medical condition and other factors, such as your weight. DOXY tablets are usually taken up to 12 weeks for acne treatment and one to two weeks for treating infections.

DOXY tablets should be taken with adequate amounts of food or water and you should remain upright for up to 2 hours afterwards. This is to avoid irritation and ulceration to your oesophagus (food-pipe).

When to take it

Take DOXY tablets during or immediately after a meal at about the same time each day (usually in the morning). If taken on an empty stomach, DOXY tablets may cause a stomach upset. If treatment is for acne, always take DOXY tablets with food.

Late evening ingestion of DOXY tablets should be avoided.

If you forget to take it

If it is almost time for your next dose, skip the dose you missed and take your next dose when you are meant to. Otherwise, take it as soon as you remember and then go back to taking it as you would normally.

Do not take a double dose to make up for the dose that you missed.

If you are not sure what to do, ask your doctor or pharmacist.

While you are using DOXY tablets

Things you must do

If the symptoms of your infection do not improve within days, or they become worse, tell your doctor.

If you become pregnant while you are taking DOXY tablets, tell your doctor.

If you are about to start taking a new medicine tell your doctor and pharmacist that you are taking DOXY tablets.

Things you must not do

Do not stop taking DOXY tablets or lower the dosage without checking with your doctor. You should take the full course of DOXY tablets even if you feel well or the infection may reappear.

Do not give DOXY tablets to anyone else, even if they have the same condition as you.

Do not take DOXY tablets to treat any other complaints unless your doctor tells you to.

Side Effects

All medicines can have side effects. Sometimes they are serious, most of the time they are not.

Tell your doctor if you notice any of the following and they worry you:

  • loss of appetite
  • nausea
  • diarrhoea
  • difficulty swallowing
  • headache

Tell your doctor immediately, or go to the nearest Accident and Emergency Department at your hospital if you notice any of the following:

  • inflammation (heat, pain, swelling or redness) of: the tongue, the intestinal area, the region around the genitals and anus (with thrush)
  • skin reactions - discoloured spots or patches of skin, flushed, flaky, itchy and/or red skin
  • searing pain in the oesophagus (food-pipe)
  • swelling
  • purplish or brownish-red discolouration under the skin
  • sharp chest pain
  • difficulty breathing
  • fatigue

DOXY tablets may increase the effects of systemic lupus erythematous (lupus). A disease where the body attacks it's own cells and tissues.

Stop taking DOXY tablets immediately and tell your doctor if you become sensitive to sunlight. Symptoms are: severe sunburn, redness, itching and rash.

If you experience severe stomach cramps, diarrhoea or both in combination with fever several weeks after finishing DOXY tablets, tell your doctor immediately. You may have a serious condition affecting your bowel. Do not take any diarrhoea medicine without checking with your doctor first.

Other side effects not listed above may occur in some patients.

Tell your doctor or pharmacist if you notice anything else that is making you unwell


Immediately telephone a doctor, or the Poisons Information Centre (telephone 0800 POISON and 0800 764 766) or go to the accident and Emergency Department at your nearest hospital, if you think you or anyone else may have taken too many DOXY tablets. Do this even if there are no signs of discomfort or poisoning.


Store DOXY tablets below 30°C.

Do not store DOXY tablets in the bathroom or near a sink. Do not leave it in the car on hot days. Heat and dampness can destroy some medicines.

Keep your tablets in the original pack they are provided in until it is time to take them. If you take the tablets out of the pack they may not keep well.

Keep it out of reach of children. A locked cupboard at least one-and-a-half metres above the ground is a good place to store medicines.


If your doctor tells you to stop taking this medicine or the tablets have passed their expiry date, ask your pharmacist what to do with any that are left over

Product description

What it looks like

DOXY-50 tablets are : white, film coated, circular biconvex tablets, having a diameter of approximately 6.3mm. They come in bottles containing 30 tablets and calendar packs containing 30 tablets.

DOXY-100 tablets are: white, film-coated, circular, biconvex tablets scored on one side and having a diameter of 8mm. They come in bottles containing 100 tablets


Douglas Pharmaceuticals Ltd
Central Park Drive, Lincoln

Date of Preparation: 09th May 2007

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