taking medicine whenever symptoms arise, instead of steadily over a prescribed period / Short for 頓服薬 (tonpukuyaku).

(literally) sake lees and rice bran / something worthless

夏: summer

to go; to come to one's place / to (a letter) be delivered / to depart / to rely (on a method) / (年が～) to age / (うまく～) to go well / イく: (slang) to have an orgasm, to come, to cum