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The most common side effects (that affect less than 1 person in 10) are:
• dry mouth
• blurred vision
• changes in the heart beat
• constipation and difficulty in passing water.
These side effects tend to improve with time.
Other side effect you may also experience are:
• drowsiness
• increased sweating
• skin rashes
• tremor (shaking)
• changes in sexual function
• low blood pressure, which may cause dizziness or fainting.
Rare side affect (that affect less than 1 person in 1000) are:
• changes in the blood and changes in hormone levels (these will be found if you have blood tests)
• severe mood changes such as extreme excitability
• fits
An increased risk of bone fractures has been observed in patients taking this type of medicines.
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 these capsules in the original container, and in a safe place (preferably a locked
cupboard) where children cannot see or reach them. Your medicine could seriously harm them.
Do not take this product after the ‘use by’ date shown on the carton.
If your doctor decides to stop the treatment, you must return any left over capsules to your
pharmacist. Only keep the capsules if your doctor tells you to.
What Prothiaden contains
- The active substance is dosulepin hydrochloride
- The other ingredient are lactose, maize starch and magnesium stearate.
- The capsule shell contains gelatin, with small amounts of iron oxide, shellac, titanium dioxide
(E171), erythrosine (E127), polydimethylsiloxane and soya lecithin
What Prothiaden looks like and contents of the pack
Prothiaden capsules are red and brown with the marking ‘P25’ in white.
Prothiaden capsules are available in a child resistance blister pack of 28.
Marketing Authorisation Holder
Teofarma S.r.l, Via F.lli Cervi 8, 27010 Valle Salimbene (PV), Italy
Fax: 0039 0382 525845 - e-mail:
Teofarma S.r.l, Viale Certosa 8/A, 27100 Pavia (PV), Italy
This leaflet was last approved in December 2016.


Prothiaden 25 mg capsules
Dosulepin hydrochloride BP
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 becomes serious, or if you notice any side effects not listed in this
leaflet, please tell your doctor or pharmacist.
In this leaflet:
What Prothiaden is and what it is used for
Before you take Prothiaden capsules
How to take Prothiaden
Possible side effects
How to store Prothiaden
Further information
Prothiaden belongs to a group of medicines called antidepressants. This medicine is used to
treat depression and can also help reduce feelings of anxiety. This medicine will only be used
when other medicines have been found to be unsuitable. Please ask your doctor or pharmacist
if you need more information.
Do not take Prothiaden capsules if and speak to your doctor if:
- you know that you are allergic (hypersensitive) to dosulepin or any of the other ingredients
(listed in section 6 of this leaflet) in your capsules
- you have an irregular heart beat or any other heart problems
- you have liver problems
- you have an eye condition known as glaucoma
- you are a man that has prostate problems (difficulty in passing water)
- you have been diagnosed as having mania (feeling over-excited with unusual behaviour)
- you have fits (epilepsy)
Take special care with Prothiaden capsules if:
- you are going to have general or dental surgery, tell your surgeon or dentist you are taking
Prothiaden capsules. It may affect the anaesthetic used.
Taking other medicines
• You should tell your doctor is you are taking or have taken any of the following medicines as
they may affect how your capsules work:

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• A medicine used to treat depression called a mono-amine oxidase inhibitor (MAOI). You
should not take your capsules at the same time as MAOIs or within 14 days of stopping
• Other medicines used to treat depression called SSRIs (selective serotonin re-uptake
• Any medicines given to you for treating high blood pressure (hypertension).
• Any hay fever/allergy medicines which contains terfenadine or astemizole.
• Sotalol (a medicine for heart or blood pressure problems) or halofantrine (a medicine for
• Any medicines called barbiturates (e.g. phenobarbitone for fits, amylobarbitone for
sleeplessness) or methylphenidate (used to treat behavioural problems).
• Any medicine containing an opioid (these include codeine, morphine, co-proxamol and codydramol.)
• Medicines called sympathomimetic agents - these include ephedrine, pseudoephedrine,
adrenaline and noradrenaline (these may be found in medicines used to treat heart problems
and asthma as well as some decongestants and cough/cold remedies.)
Please tell your doctor or pharmacist if you are taking or have recently taken any other
medicines, including medicines obtained without a prescription.
Thoughts of suicide and worsening of your depression or anxiety disorder
If you are depressed and/or have anxiety disorders you can sometimes have thoughts of
harming or killing yourself. These may be increased when first starting antidepressants, since
these medicines all take time to work, usually about two weeks but sometimes longer.
You may be more likely to think like this:
- If you have previously had thoughts about killing or harming yourself.
- If you are a young adult. Information from clinical trials has shown an increased risk of
suicidal behaviour in adults aged less than 25 years with psychiatric conditions who were
treated with an antidepressant.
- If you have thoughts of harming or killing yourself at any time, contact your doctor or go to
a hospital straight away.
You may find it helpful to tell a relative or close friend that you are depressed or have an
anxiety disorder, and ask them to read this leaflet. You might ask them to tell you if they think your
depression or anxiety is getting worse, or if they are worried about changes in your behaviour.
Pregnancy and breast-feeding
If you are or think you might be pregnant or you plan to become pregnant, or if you are breastfeeding you must tell your doctor before you take this medicine. Your doctor will decide if you
can take these capsules.
Driving and using machines
These capsules can make you feel drowsy. Do not drive, operate machinery or do anything that
requires you to be alert until you know how the capsules will affect you. Feeling drowsy in the day
can improve with time, but if drowsiness becomes a problem, you should tell your doctor.
If you drink alcohol with these capsules this can make the feeling of drowsiness worse.
Important information about some of the ingredients of Prothiaden capsules
These capsules contain an ingredient called lactose. If you have been told by your doctor that
you have an intolerance to lactose, contact your doctor before taking this medicine.

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Your doctor will tell you how many capsules to take and when you should take them. This will
also be on the carton label. Ask your pharmacist or doctor for help if you are not sure how to
take your capsules or if you want more information. The following information is given as guide
The capsules should be swallowed whole with a drink of water. Do not chew the capsules as
you may get a bitter taste in your mouth and a temporary numbness of your tongue.
Adults: The usual starting dose is 3 capsules a day. Your doctor may ask you to increase this.
Your doctor will tell you whether to take the capsules as separate doses throughout the day or
as a single dose each evening, usually a couple of hours before you go to bed. Normally, not
more than 9 capsules should be taken each day.
Elderly: The usual starting dose is between 1 and 3 capsules a day.
It may take two to four weeks of treatment before you begin to see an improvement in your mood
although you might feel there is an improvement in your anxiety symptoms before then. It is
important that you keep taking these capsules until your doctor tells you to stop.
If you stop taking Prothiaden
Do not stop taking these capsules just because you feel better. If you stop taking the capsules
too soon, your condition may get worse. If your doctor wants you to stop taking these capsules,
your doctor will ask you to stop gradually.
If you forget to take Prothiaden
Do not worry. Simply leave out that dose completely and then take your next dose at the right
time. Do not take a double dose to make up for a forgotten capsule. If you are unsure, check
again with your doctor or pharmacist.
If you take more Prothiaden than you should
You should only ever take the number of capsules that your doctor has told you to take. Do not
change the dose yourself. If you think your capsules are not working well enough, speak to your
doctor to see if the dose can be increased.
These capsules may seriously harm you and may be life threatening if you take too many
capsules. You should seek immediate help if a child takes any capsules or if you or
anybody else accidentally takes too many capsules. Remember to take the pack with you,
even if it is empty.
Like all medicines, Prothiaden capsules can cause side effects, although not everybody gets
If you get any of the following symptoms after taking these capsules, you should
contact your doctor immediately:
• a fever (high temperature, sweating, shivering)
• discomfort around the right lower rib cage
• hepatitis (damage to the liver causing dark urine, jaundice (yellowing of the skin or
whites of the eyes), nausea and fever)

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