Problems in practice can take a number of forms.Some are simple and easy to resolve, such as the lack of knowledge regarding possible interaction between two prescribed medicines. In this situation you would consult an authority such as the current edition of the British National Formulary or speak to a more experienced colleague.

However in pharmacy practice the individual pharmacist is often working as a sole practitioner, possibly at times when other (human) resources cannot be contacted for advice, such as late at night or at weekends.
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Immunity may be defined as the state of being immune to or protected from a disease especially an infectious disease.
Importantly, this particular state is invariably induced by having been exposed to the antigenic marker on an microorganism that critically invades the body or by having been duly immunized with a vaccine capable of stimulating the production of specific antibodies.

Immunology, the generation of an immune response solely depends upon the prevailing interaction of three cardinal components of the immune mechanism, such as :
1. immunogen stimulation,
2. humoral immune system, and
3. cellular immune system.
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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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