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This medicine is available as either of the above names but will be referred to as Septrin throughout this leaflet.
Read all of this leaflet carefully before you start taking this medicine

Keep this leaflet. You may need to read it again.

If you have any further questions, ask your doctor or pharmacist.

This medicine has been prescribed for you. Do not pass it on to others. It may harm them, even if their
symptoms are the same as yours.

If any of the side effects gets serious, or if you notice any side effects not listed in this leaflet, please tell your
doctor or pharmacist.
In this leaflet:
1. What Septrin is and what it is used for
2. Before you take Septrin
3. How to take Septrin
4. Possible side effects
5. How to store Septrin
6. Further information
Septrin is made up of two different medicines called sulfamethoxazole and trimethoprim. These medicines are
sometimes given the combined name co-trimoxazole. Both belong to a group of medicines called antibiotics. They
are used to treat infections caused by bacteria. Like all antibiotics, Septrin only works against some types of
bacteria. This means that it is only suitable for treating some types of infections.
Septrin can be used to treat or prevent:
• lung infections (pneumonia or PCP) caused by a bacteria called Pneumocystis jiroveci (previously known as
Pneumocystis carinii)
• infections caused by a bacteria called Toxoplasma (toxoplasmosis).
Septrin can be used to treat:
• bladder or urinary tract infections (water infections)
• lung infections such as bronchitis
• ear infections such as otitis media
• an infection called nocardiosis, it can affect the lungs, skin and brain.
Do not take Septrin if:
• you are allergic (hypersensitive) to sulfamethoxazole, trimethoprim or co-trimoxazole or any of the other
ingredients of Septrin (see section 6: Further information)
• you are allergic to sulphonamide medicines. Examples include sulphonylureas (such as gliclazide and
glibenclamide) or thiazide diuretics (such as bendroflumethiazide – a water tablet)
• you have liver or kidney problems
• you have ever had a problem with your blood
• it is for your child and they are less than 6 weeks old or were premature. Unless it is for the treatment or
prevention of PCP. In this case, babies should be at least 4 weeks old.
If you are not sure if any of the above apply to you, talk to your doctor or pharmacist before taking Septrin.
Take special care with Septrin
Before you take Septrin, tell your doctor or pharmacist if:
• you have severe allergies or asthma
• potentially life-threatening skin rashes (Stevens-Johnson syndrome, toxic epidermal necrolysis) have been
reported with the use of Septrin appearing initially as reddish target-like spots or circular patches often with
central blisters on the trunk.
• additional signs to look for include ulcers in the mouth, throat, nose, genitals and conjunctivitis (red and swollen
• these potentially life-threatening skin rashes are often accompanied by flu-like symptoms. The rash may
progress to widespread blistering or peeling of the skin.
• the highest risk for occurrence of serious skin reactions is within the first weeks of treatment.
• if you have developed Stevens-Johnson syndrome or toxic epidermal necrolysis with the use of Septrin you
must not be re-started on Septrin at any time.
• if you develop a rash or these skin symptoms, stop taking Septrin, seek urgent advice from a doctor and tell him
that you are taking this medicine.
• you have been told that you have a rare blood problem called porphyria, which can affect your skin or nervous
• you don’t have enough folic acid (a vitamin) in your body - which can make your skin pale and make you feel
tired, weak and breathless. This is known as anaemia
• you have ever had jaundice which can cause yellowing of your skin or the whites of your eyes
• you have a problem with your metabolism called phenylketonuria and are not on a special diet to help your
• you are elderly
• you are underweight or malnourished
• you have been told by your doctor that you have a lot of potassium in your blood.
If you are not sure if any of the above apply to you, talk to your doctor or pharmacist before taking Septrin.
Taking other medicines
Please tell your doctor or pharmacist if you are taking or have recently taken any other medicines, including
medicines obtained without a prescription. This includes herbal medicines. This is because Septrin can affect the
way some medicines work. Also some other medicines can affect the way Septrin works.
In particular tell your doctor or pharmacist if you are taking any of the following medicines:
Diuretics (water tablets), which help increase the amount of urine you produce
Pyrimethamine, used to treat and prevent malaria, and to treat diarrhoea
Ciclosporin, used after transplant operations or for your immune system
Medicines used to thin the blood such as warfarin
Phenytoin, used to treat epilepsy (fits)
Medicines for diabetes, such as glibenclamide, glipizide or tolbutamide (sulphonylureas)
Medicines to treat problems with the way your heart beats such as digoxin or procainamide
Amantadine, used to treat Parkinson’s disease, multiple sclerosis, flu or shingles
Medicines to treat HIV (Human Immunodeficiency Virus), called zidovudine or lamivudine
Medicines that can increase the amount of potassium in your blood, such as diuretics (water tablets, which help
increase the amount of urine you produce), steroids (like prednisolone) and digoxin
• Methotrexate, a medicine used to treat cancer or for your immune system.
If you are not sure if any of the above apply to you, talk to your doctor or pharmacist before taking Septrin.

Taking Septrin with food and drink
You should take Septrin with some food or drink. This will stop you feeling sick (nausea) or having diarrhoea.
Although it is better to take it with food, you can still take it on an empty stomach.
Drink plenty of fluid such as water while you are taking Septrin.
Pregnancy and breast-feeding
Talk to your doctor before taking this medicine if you are pregnant, planning to get pregnant, or breast-feeding.
Always take Septrin exactly as your doctor has told you.
The label on your pack will tell you how much to take and how often to take it. You should check with your doctor or
pharmacist if you are not sure.
Usual Dose
Adults and children over 12 years
• The usual dose is two tablets in a morning and two tablets in an evening.
• Septrin should be taken for at least five days.
• Make sure that you finish the course of Septrin which your doctor has prescribed.
Septrin is not usually given to children under 12 years old. If they have been given to your child please speak to
your doctor or pharmacist for more information.
Special Dose
The dose of Septrin and how long you need to take it depends on the infection you have and how bad it is. Your
doctor may prescribe you a different dose or length of course of Septrin to
• treat urinary tract (water) infections
• treat and prevent lung infections caused by the bacteria Pneumocystis jiroveci
• treat infections caused by the bacteria Toxoplasma (toxoplasmosis) or Nocardia (nocardiosis).

If you have kidney problems your doctor may
• prescribe a lower dose of Septrin
• take blood to test whether the medicine is working properly.
If you take Septrin for a long time your doctor may
• take blood to test whether the medicine is working properly
• prescribe folic acid (a vitamin) for you to take at the same time as Septrin.
If you take more Septrin than you should
If you take more Septrin than you should, talk to your doctor or go to a hospital straight away. Take the medicine
pack with you.
If you have taken too much Septrin you may

• feel or be sick
• feel dizzy or confused.
If you forget to take Septrin
• If you forget to take a dose, take it as soon as you remember it.
• Do not take a double dose to make up for the forgotten dose.
Like all medicines Septrin can cause side effects, although not everybody gets them. You may experience the
following side effects with this medicine.
Stop taking Septrin and tell your doctor immediately if you have an allergic reaction. Chances of an allergic reaction
is very rare (fewer than 1 in 10,000 people are affected), signs of an allergic reaction include
Allergic reactions
• Difficulty in breathing
• Fainting
• Swelling of face
• Swelling of mouth, tongue or throat which may be red and painful and/or cause difficulty in swallowing
• Chest pain
• Red patches on the skin
Very Common (more than 1 in 10 people)
• High levels of potassium in your blood, which can cause abnormal heart beats (palpitations).
Common (less than 1 in 10 people)
• An infection called thrush or candidiasis which can affect your mouth or vagina. It is caused by a fungus
• Headache
• Feeling sick (nausea)
• Diarrhoea
• Skin rashes.
Uncommon (less than 1 in 100)
• Being sick (vomiting).
Very Rare (less than 1 in 10,000 people)
• Fever (high temperature) or frequent infections
• Sudden wheeziness or difficulty breathing
• Potentially life-threatening skin rashes (Stevens-Johnson syndrome, toxic epidermal necrolysis) have been
reported (see Take special care with Septrin).
• Mouth ulcers, cold sores and ulcers or soreness of your tongue
• Skin lumps or hives (raised, red or white, itchy patches of skin)
• Blisters on your skin or inside your mouth, nose, vagina or bottom
• Inflammation of the eye which causes pain and redness
• The appearance of a rash or sunburn when you have been outside (even on a cloudy day)
• Low levels of sodium in your blood
• Changes in blood tests
• Feeling weak, tired or listless, pale skin (anaemia)
• Heart problems
• Jaundice (the skin and the whites of your eyes turn yellow). This can occur at the same time as unexpected
bleeding or bruising
• Pains in your stomach, which can occur with blood in your faeces (poo)
• Pains in your chest, muscles or joints and muscle weakness
• Arthritis
• Problems with your urine. Difficulty passing urine. Passing more or less urine than usual. Blood or cloudiness in
your urine.
• Kidney problems
• Sudden headache or stiffness of your neck, accompanied by fever (high temperature)
• Problems controlling your movements
• Fits (convulsions or seizures)
• Feeling unsteady or giddy
• Ringing or other unusual sounds in your ears
• Tingling or numbness in your hands and feet
• Seeing strange or unusual sights (hallucinations)
• Depression
• Muscle pain and/or muscle weakness in HIV patients.
If any of the side effects gets serious, or if you notice any side effects not listed in this leaflet, please tell your
doctor or pharmacist.
Reporting of side effects
If you get any side effects, talk to your doctor, pharmacist or nurse. This includes any possible side effects not
listed in this leaflet. You can also report side effects directly via the Yellow Card Scheme at:
By reporting side effects you can help provide more information on the safety of this medicine.
• Keep out of the sight and reach of children.
• Keep container in the outer carton. Do not store above 25°C.
• Do not take the tablets after the expiry date shown on the pack and blisters. The expiry date refers to the last
day of that month.
• If the tablets become discoloured or show signs of any deterioration, you should seek the advice of your
pharmacist who will advise you what to do.
• If you have any tablets left over when your doctor tells you to stop taking them, return them to the pharmacist.
• Medicines should not be disposed of via wastewater or household waste. Ask your pharmacist how to dispose
of medicines no longer required. These measures will help protect the environment.
What Septrin Tablets contains
Each tablet contains 80 mg of trimethoprim and 400 mg of sulfamethoxazole as the active ingredients. These
medicines are sometimes given the combined name co-trimoxazole.
The other ingredients of Septrin Tablets are:
sodium starch glycollate, povidone K30, dioctyl sodium sulphosuccinate and magnesium stearate.
What Septrin Tablets looks like and contents of the pack
Septrin Tablets are white, round tablet with a score-line on one side and plain on the other side.
Septrin Tablets come in packs of 20, 30 or 100, but your pharmacist will dispense the right amount of tablets
according to your prescription.
PL No: 15814/0914


Septrin Tablets / Co-trimoxazole 80mg/400mg Tablets


This product is manufactured by Alcala farma, S.L, Alcala de Henares, Madrid, Spain and is procured from within
the EU and repackaged by the product licence holder: OPD Laboratories Limited, Unit 6 Colonial Way, Watford,
Herts WD24 4PR.
Leaflet revision and issue date (Ref.): 19.05.2015.
Septrin is a registered trademark of Aspen.
To request a copy of this leaflet in Braille, large print or audio please call 01923 332 796.

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