Delphi L Injection by Mcastro Pharma is a prescription injection containing methylcobalamin (vitamin B12) 1.5 mg, nicotinamide (vitamin B3) 100 mg and pyridoxine (vitamin B6) 100 mg in each 2 ml ampoule. It is given by a healthcare professional into the muscle to treat deficiency of these vitamins and related nerve problems.
Last reviewed: November 2026. General information only, not medical advice. Contents and strengths can differ by manufacturer and batch, so always check your pack and follow your doctor.
Quick Facts
| Per 2 ml | Methylcobalamin 1.5 mg + Nicotinamide 100 mg + Pyridoxine 100 mg |
| Type | Injection (intramuscular) |
| Manufacturer | Mcastro Pharma, Jabalpur |
| Pack | 2 ml ampoule or vial |
| Prescription | Required (Rx) |
Delphi L Injection Composition
- Methylcobalamin (vitamin B12) 1.5 mg
- Nicotinamide (vitamin B3) 100 mg
- Pyridoxine (vitamin B6) 100 mg
What Is Delphi L Injection Used For?
- Vitamin B12, B3 and B6 deficiency
- Megaloblastic anaemia due to B12 deficiency
- Peripheral neuropathy from vitamin deficiency
- Pellagra from severe niacin deficiency
How It Works
Methylcobalamin supports nerves and red blood cell formation, nicotinamide supports metabolism and skin, and vitamin B6 supports nerve function and protein metabolism.
How to Take It
It is given slowly into the muscle by a healthcare professional. The dose and how often are decided by your doctor, and the listing gives no fixed dose.
Possible Side Effects
Possible side effects include:
- Pain or redness at the injection site
- Nausea or headache
- Dizziness
- Acne
- Diarrhoea
- Rash or itching
Seek urgent help for swelling of face or lips, breathing difficulty or severe allergic reaction. Very high long-term vitamin B6 doses can cause nerve problems.
Precautions and Who Should Be Careful
- Only for use under medical supervision
- Use caution in kidney or liver disease
- Safety in children is not established
- Elderly patients may need a lower starting dose
- Pregnancy: use only if benefits outweigh risks, as your doctor advises
- Stop use if allergy signs appear
- Proton pump inhibitors and H2 blockers can lower B12 absorption
- Nicotinamide may raise bleeding risk with heparin or blood thinners
- Use caution in Leber disease, gallbladder disease and peptic ulcer
- Store below 30 C, away from light, do not freeze
Key Points to Remember
- Methylcobalamin 1.5 mg plus nicotinamide 100 mg plus B6 100 mg per 2 ml
- Intramuscular injection given by a professional
- For documented vitamin deficiency or neuropathy
- Tell your doctor about blood thinners and acid reducers
When to Contact a Doctor
- Numbness, tingling or weakness persists
- You have anaemia symptoms: tiredness, pallor, breathlessness
- You take blood thinners
- You have kidney or liver disease or are pregnant
Practical Tips
- Get B12 levels checked before and after treatment
- Eat B12 sources: milk, curd, eggs, fish, fortified foods
- Vegetarians and people on long-term acid reducers should monitor B12
- Report any injection-site swelling
Questions to Ask Your Doctor or Pharmacist
- Is my B12 level low?
- How many injections do I need?
- Can I switch to tablets later?
- Does it interact with my medicines?
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Frequently Asked Questions
What is Delphi L injection used for?
It is used for vitamin B12, B3 and B6 deficiency, B12 related anaemia and nerve problems from deficiency.
What does Delphi L injection contain?
Methylcobalamin 1.5 mg, nicotinamide 100 mg and vitamin B6 100 mg per 2 ml.
How is Delphi L given?
Slowly into the muscle by a healthcare professional.
Is Delphi L safe in pregnancy?
Only if your doctor decides benefits outweigh risks.
Further reading: NIH Office of Dietary Supplements: Vitamin B12 | NIH Office of Dietary Supplements: Vitamin B6 | NIH Office of Dietary Supplements: Niacin