na-adjective
medical; medically
Used to describe something from a medical standpoint or in a medical context. Often used as a na-adjective or adverbially with に.
医学的に見て、その治療法は効果的だ。
From a medical perspective, that treatment is effective.
彼の症状は医学的な説明が難しい。
His symptoms are difficult to explain medically.
医学 is the noun 'medical science', whereas 医学的 is the adjectival form used to describe things as medical.
Compound of 医学 (igaku, 'medical science') + 的 (-teki, '-like, -ical'). The suffix 的 is a productive way to form adjectival nouns from nouns.