Role of first - Pass Metabolism in Drug therapy

Pharmacy
1

Ever wondered why some drugs are not given orally even though swallowing a tablet is easier?

When a drug is taken by mouth, it first travels to the liver through the portal circulation before reaching systemic circulation. This process is called First-Pass Metabolism — where a significant portion of the drug gets metabolized before it can exert its therapeutic effect.

:microscope: Why does it matter?

• Reduces drug bioavailability

• Alters required dose strength

• Influences route of administration

• Can lead to variability in patient response

Clinical Insight:

Drugs with extensive first-pass metabolism (like nitroglycerin or propranolol) are often given via sublingual, transdermal, or intravenous routes to bypass the liver initially.

:books: Understanding first-pass metabolism helps pharmacists and healthcare professionals design safer and more effective drug therapies.

MBH/PS

4 Likes
2

Great content.

3

As a healthcare professional :woman_health_worker: , First pass metabolism was the first exciting topic I learned in pharmacology :medical_symbol: :pill: . Understanding this mechanism is crucial for deciding the preferred route of administration of drugs in patients.

This was a perfect refresher @Ankita25 :+1:

1 Like
4

Yes, understanding it is essential for optimizing therapeutic effectiveness and patient safety

5

Every drug have different metabolism pathway.With correct knowledge and guidance, effect of drugs can be achieved.

6

First pass metabolism is mainly seen in oral drugs. It is the process ofinitial metabolism of drug in liver .