In the Sharangdhar Samhita there is a concept of setting the threshold of effectiveness limitation of the Kalpana. From modern point of view it can be termed as expiree limitation of the drugs. In modern times the expiree limitations of the various ayurvedic medicines have risen as at the time of Sharangdhar, there were not much knowledge of storage and preservation methods. In  modern medicines, the expiree date of all drugs is maximum  to three years from the date of manufacturing. In ayurveda some preparations are the more effective as they become old. The basic expiry limitation of various Kalpana in ayurveda can be classified as under-

• Instantly usable –phant, upnaah and Basti

• 4 hours-hima and swaras

• 1 day-kalaka,takra, ksheerpaak, quath, anna, paanak, peya, dadhikurchika, udak, lepa, udak, mand, vilepi, maans, maansarasa, yavagu, yusah, manth and khad

• 1 month-khand, malahar and saktu

• 2 months- Manjan and choorna

• 6-momnth-sharkara, amlasandhan and dhoopan

• 1 year- anjana, arka, kshaara, tailmasi, vatak and vati

All the organo-mineral preparations like asava, aristha, bhasma and parpati are said to have more efficacy as they become older. Nowadays the expiry limitation of the medicines have changed due to preservative methods have become more advanced these days .So the expiry limitations of those medicines falling in the category of 2 to 6 months can be extended to 1 year.

Similarly the drops are very well preserved thus they can be used for more than one day i.e. 15 days from opening the container.

This is how the advancement techniques has imparted its benefits to the Bhaishajiya Kalpana (ayurvedic pharmacy).

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