The inability of metals to resist degradation as a result of corrosion remains a unique global problem that depend on different metals for daily operations. Therefore, knowing the appropriate method to use is a key to ameliorate corrosion effect on metals. Green inhibitors serve as a modern, cheaper and environmentally favorable method to retard the effects of corrosion. Drugs are corrosion inhibitors which can reduce the action of corrosion without being hazardous to the environment as they are synthesized from natural products. The review studies the metal protection techniques and the use of drug as corrosion inhibitors. The importance of copper as a useful metal as good corrosion resistance due to inherent properties alongside its malleability was also discussed.

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Corrosion as a major problem and inhibition of corrosion can be said to be the best economic option applied when mitigating corrosion. Corrosion inhibition has already been established in various commercial enterprises, either for the protection of pipes in the petroleum industry or to reduce the disintegration rate of feed water sections or boilers or also used to cut down the sulphide induced decomposition in industries that are being utilized for the gasification of steel pipelines. Thus, this overview establishes the fundamental principle of inhibitor usage on metallic materials and the factor affecting the choice of the inhibitor.