SNPS can show whether a patient reacts poorly, fairly or well to a specific medication. There is a possibility of the patient being reacting badly to a medication if the testing SNPs beforehand is removed. SNP is referred as a single nucleotide polymorphism which is a single-nucleotide substitution in DNA that occur in more than one percent general population. The combination of SNPs which is created by a different number of SNP points which points to a number of possible changes.