There are, in fact, three most critical and highly explicite situations, wherein the absolute necessity to assay the ‘antimicrobial agents’ arise, namely:
(a) Production i.e., in the course of commercial large-scale production for estimating the ‘potency’ and stringent ‘quality control’,
(b) Pharmacokinetics i.e., in determining the pharmacokinetics of a ‘drug substance’ in humans or animals, and
(c) Antimicrobial chemotherapy i.e., for strictly managing, controlling, and monitoring the ensuing antimicrobial chemotherapy.
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Pathogenicity refers to the particular state of producing or being able to produce pathological changes and diseases. Therefore, the ability to cause pathogenicity of certain microorganisms is definitely an unique noticeable characteristic feature that has virtually given a tremendous boost to the earlier researches carried out with the microbes.

It has been observed that comparatively a few microbial variants actually produce disease, some microorganisms prove to be pathogenic for plants and animals, and lastly certain microbes may bring about specific disease in other microbes.
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Application of pharmaceutical principles to drug dosage forms is illust rated when drug dosage forms are categorized according to their physical state, degree of heterogeneity, and chemical composition. The usual relevant states of matter are gases, liquids, and solids. Intermolecular forces of attraction are weakest in gases and strongest in solids. Conversions from one physical state to another can involve simply overcoming intermolecular forces of attraction by adding energy (heat) . Chemical composition can have a dramatic effect on physicochemical properties and behavior. For this reason, it is necessary to distinguish between polymers, or macromolecules, and more conventional ( i .e., smaller) molecules, or micromolecules.
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Wondering what are the principles of pharmaceutical, if you had red previous article but still don’t know the basic principals, below article will discuss about it.
Pharmaceutical principles are the under lying physicochemical principles that allow a drug to be incorporated into a pharmaceut ical dosage form (example: solution, capsule) . These principles apply whether the drug is
extemporaneously compounded by the pharmacist or manufactured for commercial distribution as a drug product.
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