In India, the pharmaceutical industry is a thriving sector that produces a wide range of active pharmaceutical ingredients (APIs). The popularity of APIs can vary over time and depend on factors such as market demand and therapeutic needs. While it's challenging to pinpoint the exact top 10 most popular APIs in India at any given time, here are 10 APIs that have been widely used and are in high demand in the Indian pharmaceutical market:

1. Paracetamol (acetaminophen): A commonly used API for pain relief and fever reduction.

2. Metformin: An API used in the treatment of type 2 diabetes.

3. Ibuprofen: An API belonging to the class of nonsteroidal anti-inflammatory drugs (NSAIDs) used for pain management.

4. Amlodipine: An API used to treat hypertension (high blood pressure) and certain heart conditions.

5. Omeprazole: An API used to reduce gastric acid secretion for the treatment of gastric ulcers and gastroesophageal reflux disease (GERD).

6. Ciprofloxacin: A broad-spectrum antibiotic API used to treat various bacterial infections.

7. Atorvastatin: An API used to lower cholesterol levels and prevent cardiovascular diseases.

8. Losartan: An API used in the treatment of hypertension and certain heart conditions.

9. Pantoprazole: An API used to reduce gastric acid secretion and treat conditions like gastric ulcers and GERD.

10. Sertraline: An API belonging to the selective serotonin reuptake inhibitor (SSRI) class used as an antidepressant.

It's important to note that the popularity of APIs can vary over time due to factors such as evolving medical needs, emerging diseases, and the introduction of new medications. The pharmaceutical market is dynamic, and APIs are continually evolving to address the changing healthcare landscape.

This article is written to inform rather than advise and commercial purposes. It is always a good idea to get in touch with us for more information on pharmaceutical APIs.