Pharma chemicals include active pharmaceutical ingredients (APIs), intermediates, excipients, solvents, reagents, and fine chemicals. Active pharmaceutical ingredients are the primary components responsible for the therapeutic effect of a medicine. Intermediates are compounds used during the synthesis of APIs, while excipients are inactive substances added to formulations to support stability, delivery, and absorption of the drug. Solvents and reagents are used during chemical reactions and purification processes in pharmaceutical manufacturing.