*Trending Advancements in Technologies Pertinent to Therapeutical Pharmacodynamics DOI: http://dx.doi.org/10.5772/intechopen.107341*

behavior of the drug. Age is one of the significant physiological factors affecting the drug's action. When fixing the dosage of the drug, the age of the patients is necessary to be taken into account because, the absorption and distribution of the drug dosage requires more attention than the binding site of target. This is the reason why clinical trials mostly involve the middle and old age patients. Next to age, specificity becomes an important physiological factor affecting the drug's effect and response. The drug and the target should be very specific to provide successful results, otherwise it may lead to fatal results and hence, accuracy of monitoring is very much important. Another physiological factor to be considered is the time duration which can be defined as either at which time the drug enters the body or the time the drug reaches the target and at which time it's being excreted [12].
