Dr. Arjun Srivastav Pirfenex 400 mg is a prescription tablet containing the active ingredient pirfenidone in 400 mg strength. It belongs to a group of medicines called antifibrotic agents and is manufactured by Cipla.
The tablet is used in the management of idiopathic pulmonary fibrosis, a progressive lung condition. This page explains what the medicine is, how it works, how to take it, possible side effects, safety advice, drug interactions, monitoring, storage, and common questions.
The information is based on verified product and consumer medicine information so you can understand the medicine clearly before discussing it with your doctor.
What Is Pirfenex 400 Mg?
Pirfenex 400 mg is a prescription medicine that contains pirfenidone 400 mg as its active ingredient. It is an oral film coated tablet intended for adult medical use under the supervision of a healthcare professional.
Pirfenex is the brand name and pirfenidone is the generic active substance. This means Pirfenex 400 mg and pirfenidone 400 mg refer to the same medicine in the same strength.
The medicine is classified as an antifibrotics, which means it works on the processes involved in tissue scarring. Pirfenex is manufactured by Cipla Limited, a pharmaceutical company based in India, as confirmed on the product packaging and prescribing information.
Because it is a prescription medicine, Pirfenex 400 mg should only be started, adjusted, or stopped by a doctor. The tablet strength tells you how much active ingredient is in one tablet, while your actual treatment schedule depends on your individual needs.
What Is Pirfenex 400 Mg Used For?
Idiopathic Pulmonary Fibrosis (IPF)
Idiopathic pulmonary fibrosis, often called IPF, is a chronic lung condition in which the lung tissue becomes thickened and scarred over time. The scarring is known as fibrosis, and it makes the lungs stiffer so that breathing becomes harder.
The word idiopathic means the exact cause of the fibrosis is not known. IPF is a progressive disease, which means it tends to worsen gradually rather than staying the same.
Because the scarring builds up slowly, symptoms such as breathlessness and a persistent cough often develop over months or years. Antifibrotic treatment may be prescribed as part of the medical management of IPF, alongside regular review of lung function and overall health.
If you have ongoing respiratory symptoms or concerns about your lung health, preparing questions to ask your doctor about lung health can help you discuss your symptoms and any recommended tests.
The decision to start treatment, and which medicine is suitable, is made by a specialist based on your diagnosis and test results.
What Pirfenex Is Intended to Do
Pirfenex 400 mg is intended to help slow the progression of idiopathic pulmonary fibrosis. Treatment with pirfenidone aims to reduce the rate at which lung function declines, which is why it is described as an antifibrotic medicine rather than a cure.
It does not simply remove scar tissue that has already formed, and it does not repair damage that is already present. Response to treatment varies between patients, so some people may notice a steadier condition while others continue to experience changes over time.
Australian and international guidance supports pirfenidone as an antifibrotic option for IPF. It is not a cure for pulmonary fibrosis, it does not repair the lungs, and it does not reverse existing lung damage. Your doctor will monitor your response and decide whether the medicine should be continued, adjusted, or reviewed.
How Does Pirfenex 400 Mg Work?
Pirfenidone, the active ingredient in Pirfenex 400 mg, is an antifibrotic medicine. Its exact mechanism of action has not been fully established, and this is clearly stated in the Australian consumer medicine information and product information documents.
Because the complete mechanism is not yet known, it would be misleading to present any single pathway as the full explanation of how the medicine works. What the available evidence does indicate is that pirfenidone shows both antifibrotic and anti inflammatory activity in laboratory and animal studies.
It appears to act on pathways involved in fibrotic and inflammatory processes, including the release of certain cytokines that contribute to tissue scarring. The goal of treatment is to slow the progression of fibrosis over time rather than to provide instant relief of symptoms.
For this reason, the medicine is taken on an ongoing basis as prescribed, and its effect is judged through regular medical review rather than immediate changes in how you feel.
How to Take Pirfenex 400 Mg
Take Pirfenex 400 mg exactly as prescribed by your doctor. The tablet should be swallowed whole with water as directed, and you should not chew, crush, or break it.
Pirfenidone is taken with food or immediately after food, which helps the body absorb it and may reduce stomach upset. Try to take your doses around the same times each day so the amount of medicine in your body stays steady.
Keep the following points in mind during treatment:
- Do not increase or decrease the dose on your own, even if you feel your symptoms have changed
- If you miss a dose, take it as soon as you remember, unless it is close to the time of your next dose
- Do not take a double dose to make up for a missed one
- Do not stop taking Pirfenex 400 mg without speaking with your prescriber first
- If treatment has been interrupted for a prolonged period, contact your doctor before starting again
Changing the dose yourself can affect how well the treatment works and may increase the chance of side effects.
💡 Tip
Pirfenex 400 Mg Side Effects
Like all medicines, Pirfenex 400 mg can cause side effects, although not everyone gets them. Knowing the common and serious effects helps you recognise what to watch for and when to contact your doctor.
🚨 Important
Pirfenex 400 Mg Drug Interactions
Some medicines can change how pirfenidone works, or increase the risk of side effects. Tell your doctor or pharmacist about every medicine you take, including:
- Prescription medicines
- Over the counter medicines
- Vitamins
- Supplements
Pay particular attention to medicines that affect an enzyme in the body called CYP1A2, because pirfenidone is mainly processed through this pathway. Examples listed in the Australian consumer medicine information include:
- Fluvoxamine
- Ciprofloxacin and enoxacin
- Omeprazole
- Rifampicin
- Amiodarone
- Propafenone
Medicines that increase photosensitivity can also add to the skin effects of pirfenidone. You should also avoid drinking grapefruit juice while taking this medicine, because it may affect how the treatment works.
This is not a complete list, so always check with your doctor or pharmacist before starting or stopping any medicine, including herbal products.
🔵 Reminder
Pirfenex 400 Mg Safety Advice
Sun exposure
Pirfenidone can increase photosensitivity, meaning your skin becomes more sensitive to sunlight. Use sunscreen daily, wear protective clothing, and cover your arms, legs, and head when outdoors. Avoid sunlamps and tanning beds while taking this medicine.
Smoking
Cigarette smoking can reduce the amount of pirfenidone in your body by around half, which may make the medicine less effective.
Liver health
Your doctor will check your liver function before treatment and during therapy, because pirfenidone can affect liver enzymes. Tell your doctor straight away if you notice yellowing of the skin or eyes, dark urine, loss of appetite, or abdominal pain.
Driving
Driving or using machinery may be affected if you experience dizziness or tiredness, so take care until you know how the medicine affects you.
Pregnancy and breastfeeding
Discuss these with your doctor before starting treatment.
⚠️ Warning
Monitoring During Pirfenex 400 Mg Treatment
Regular monitoring is a key part of treatment with Pirfenex 400 mg and helps your doctor check that the medicine is working safely for you.
Liver function tests are performed before treatment begins and then at regular intervals during therapy, because pirfenidone can affect liver enzymes. Blood tests usually measure ALT, AST, and bilirubin, and these are checked more often during the first months of treatment.
Periodic medical review allows your doctor to assess your overall response, discuss any new symptoms, and decide whether the dose needs to be adjusted. Lung function may also be assessed where appropriate, so your specialist can track changes over time.
- Report new or worsening symptoms between appointments promptly rather than waiting for your next scheduled visit
- Treatment adjustments are always determined by the prescriber and are based on your test results and how you are feeling
- Keep all your appointments and bring your medicines with you so your healthcare team can review them accurately
What Should You Avoid While Taking Pirfenex 400 Mg?
A few practical steps help you avoid unnecessary problems during treatment:
- Avoid prolonged or direct sun exposure, and stay away from sunlamps and tanning beds, because pirfenidone makes your skin more sensitive to sunlight
- Avoid smoking, as it can reduce the effect of the medicine
- Do not adjust the dose yourself
- Do not take interacting medicines, vitamins, or supplements without checking with your doctor or pharmacist first
- Avoid grapefruit juice while on treatment
- Do not ignore serious symptoms such as yellowing of the skin or eyes, dark urine, or difficulty breathing, and contact your doctor straight away if they occur
How Should Pirfenex 400 Mg Be Stored?
Store Pirfenex 400 mg according to the product packaging instructions, typically below 30 degrees Celsius. Keep the tablets in their original pack, protect them from moisture, direct heat, and light, and keep them away from children. Do not use the medicine after the expiry date printed on the pack.
Buy Pirfenex 400 Mg Online
If your doctor has prescribed Pirfenex 400 mg, you can buy it from a trusted source with a valid prescription. At australiarxmeds we supply genuine pirfenidone 400 mg tablets manufactured by Cipla, stored and handled under the conditions described on the product packaging.
Ordering through Australiarxmeds gives you access to the correct strength and pack size as prescribed, with support for any questions about your order. Always use this medicine only under the direction of your healthcare professional, and follow the dosing and safety guidance on this page.
FAQs
1. What is Pirfenex 400 mg used for?
Pirfenex 400 mg is used in the management of idiopathic pulmonary fibrosis, a progressive lung condition involving scarring of the lung tissue. It is intended to help slow disease progression and is not a cure.
2. Is Pirfenex 400 mg the same as pirfenidone 400 mg?
Yes. Pirfenex is the brand name and pirfenidone is the active ingredient, so Pirfenex 400 mg and pirfenidone 400 mg refer to the same medicine in the same strength.
3. How should Pirfenex 400 mg be taken?
Take it exactly as prescribed, swallow the tablet whole with water, and take it with food or immediately after food at around the same times each day. Do not adjust the dose yourself.
4. Should Pirfenex 400 mg be taken with food?
Yes. Pirfenidone should be taken with or immediately after food, which helps absorption and may reduce stomach upset.
5. What are the common side effects of Pirfenex 400 mg?
Common effects include nausea, dizziness, headache, reduced appetite, weight loss, diarrhoea, indigestion, fatigue, and photosensitivity or skin reactions.
6. Does Pirfenex 400 mg require liver function monitoring?
Yes. Liver function tests are done before treatment and at regular intervals during therapy, because pirfenidone can affect liver enzymes.
7. Can I stop taking Pirfenex 400 mg if I feel better?
No. Do not stop treatment without speaking with your prescriber first, even if you feel better, because stopping can affect how the medicine manages your condition.
8. Can I take Pirfenex 400 mg with other medicines?
Some medicines can interact with pirfenidone, so tell your doctor or pharmacist about all medicines, vitamins, and supplements you take before starting treatment.
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