medicinal biochem is not the same as regular biochem. In regular biochem, 1 semester is just DNA and protein, the next semester is carbohydrates, and all the pathways (glycolysis, gluconeogenesis, TCA cycle, ETC, purine and pyrimidine de novo synthesis, fat synthesis, steroids, few more but i forget).
In Medicinal biochemistry (or medicinal chemistry) you go through the classes of drugs (barbituates and benzodiazepines are the only ones i still remember eh, wonder why 😉 ) and learn the 'chemistry' and biological functions of each class. LOTS of memorizing for this class, but it's doable.