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Abbott India Limited - Sachet - 6 G
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Dosulepin + Methylcobalamin
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Prothiaden M 75 mg is used for this medicine is used in the treatment of depression, anxiety, obsessive compulsive disorder, nerve pain, migraine prevention, vitamin b deficiency, nerve pain and tingling, anaemia and tiredness due to deficiency.
Medically reviewed by Dr. Balaji Krishnan, MBBS · Updated September 2026
Prothiaden M 75 mg contains Dosulepin + Methylcobalamin. It belongs to the Antidepressant and B-complex vitamin class of medicines.
This medicine combines 2 active ingredients: Dosulepin and Methylcobalamin. Dosulepin restores the balance of the chemical messengers in the brain that regulate mood, sleep and the way pain is felt. Methylcobalamin replaces a B vitamin your body needs to make red blood cells, to keep nerves healthy and to release energy from food.
Use this medicine as your doctor has directed. Follow the dose and the duration written on your prescription.
Take it exactly as your doctor prescribed. Do not change the dose or stop early on your own.
Take it as soon as you remember. If your next dose is almost due, skip the one you missed — never take two doses together to catch up.
An overdose of this medicine can cause fits, dangerous heart rhythm disturbance and coma, and is particularly dangerous with the older tricyclic medicines. It is unlikely to cause serious harm, because the body passes surplus B vitamins out in the urine. Do not wait for symptoms to appear — go to the nearest emergency department and take the pack or strip with you.
Most side effects of Prothiaden M are mild and settle as the body adjusts. Reported side effects include:
Stop the medicine and seek help immediately for a rash, swelling of the face or lips, wheezing or difficulty breathing. Tell your doctor about any side effect that persists or worries you.
| Pregnancy | Consult your doctor before using this in pregnancy. |
|---|---|
| Breastfeeding | Consult your doctor before using this while breastfeeding. |
| Alcohol | Do not drink alcohol while taking this medicine. |
| Driving | May cause drowsiness or affect your concentration. Do not drive until you know how it affects you. |
| Kidney | Use with caution if you have kidney disease — your doctor may adjust the dose or monitor your kidney function. |
| Liver | Consult your doctor if you have liver disease. |
| Habit forming | No |
These medicines take two to four weeks to begin working, and longer for the full effect. Stopping at two weeks because nothing has changed is the commonest mistake. Never stop suddenly. Abrupt withdrawal causes dizziness, electric-shock sensations, irritability and flu-like symptoms — your doctor will reduce the dose gradually. Tell your doctor or go to hospital immediately if thoughts of harming yourself appear or worsen, particularly in the first weeks or after a dose change, and especially in anyone under twenty-five. Seek urgent care for agitation with fever, shivering, a racing heart, muscle twitching or confusion, particularly if more than one medicine affecting serotonin is being taken. Side effects are usually worst in the first fortnight and then settle. Tingling, numbness or burning in the hands and feet should be assessed by a doctor rather than self-treated — a supplement does not address the cause. Folic acid can mask a vitamin B12 deficiency while nerve damage continues, so B12 should be checked before taking folic acid long term. Bright yellow urine after a B-complex dose is expected and harmless.
Not for anyone with a known allergy to this medicine or to any ingredient in the pack. Must not be combined with a monoamine oxidase inhibitor, or started within the gap your doctor specifies after one.
Tramadol, triptans for migraine, linezolid, St John's wort and other antidepressants can together raise serotonin dangerously. Anti-inflammatory painkillers and blood thinners increase the bleeding risk when combined with this group. Long-term metformin, acid-reducing medicines and some anti-epileptics lower B12 or folate levels. Tell your doctor if you take levodopa, as vitamin B6 can reduce its effect.
Store below 30°C in the original pack, away from direct sunlight and moisture. Keep out of the reach of children.
Give it a fair trial of several weeks, and keep your review appointments. Take it at the same time each day — at night if it makes you drowsy, in the morning if it disturbs sleep. Talking therapy alongside medicine works better than either alone for most people. A supplement corrects a deficiency; it is not a general energy tonic. If you are on it for nerve symptoms, keep your review appointment so the underlying cause is looked for.

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The information on Prothiaden M 75 mg is compiled from the manufacturer's prescribing information and the sources below, and is reviewed by a registered medical practitioner. It does not replace advice from your own doctor.