、。
For external use only; do not take internally.
Literal
External-use only [on-に] use, internal-use don't-do please.
A medication-bottle warning. 外用 ('external use') and 内服 ('internal use,' 'oral administration') are pharmaceutical terms — the kind of vocabulary you'll find on medicine labels and in pharmacists' instructions. ~のみ ('only') is the formal equivalent of ~だけ, appropriate for label/warning text. ~に使用する ('use for X' or 'use on X') takes the application target with に. The written connective form 使用し chains the first instruction into the negative request 内服しないで下さい. Together this is the standard two-part safety warning format.