1. It is derived from latin word "prescripto ".

2. It is devided into four parts.

A. Superscription.

B. Inscription

C. Subscription

D. Signature

A. SUPERSCRIPTION - Main components of superscription are as follows 

- Patient's name

- Age

- Sex

- Address

- Rx - It is an abbreviated form for the Latin word " recipe" which means receive. 

B. INSCRIPTION - (MAIN PART OF PRESCRIPTION). Main components or inscription are as follows - 

- NAME of the remedy.

-  POTENCY of the remedy.

- QUANTITY Of remedy.

- VEHICLE - name and quantity.

C. SUBSCRIPTION - Instructions and directions for dispenser are written in this section.

D. SIGNATURE - Main components of signature includes. 

- Directions for patients are written in this section.

- Next reporting time is also written in this section.

- Diet and regimen 

- Remedy - route of administration.

- Signature of Physician with date and registration number.

Ques - Which is the main part of prescription?.

Ans. INSCRIPTION .