A sexy demon wolf princess is rendered unconscious by a sleeping incense drug.

A beautiful celebrity, one of the "Famous Kaou Sisters", is gassed to sleep in the back of a car.

Ariela is drugged to sleep by some scented candles.

A sexy Soldier of Justice rescues finds a young girl in trouble and manages to rescue her. It's a trap though, and our heroine is struck with a tranquilizer dart!

Full manga title is [Ichinose] Kasshoku Senshi wa Shiri de Naku (Heroine Pinch Vol. 7). Two thugs take notice of a strong beautiful female fighter. She had just finished slaying a monster in a coliseum. Instead of attacking her head on, the two thugs manage to trick her into sniffing a sleeping drug.

Full manga title: [ZENMAIN (Nejiro)] Natsuzora ni Tokeru Gunjou (Granblue Fantasy) A girl in a cute bikini is chloroformed, but it seems to only weaken her.

A young school girl is kidnapped with chloroform. She is thrown into the trunk of a car, bound and gagged. Lupin discovers her after using the car as a getaway. Contributed by Ieon

Lupin chloroforms a woman and she is replaced with a look a like. Contributed by Ieon

Keywords: circus, fujiko, lupin, tiger. Contributed by Ieon.

Nakagawa Hinata waits outside a hotel for Zen-Kun, a boy with whom she has a forbidden love with. While waiting, Hinata is approached by a guy pretending to do a survey. She is distracted and then chloroformed from behind. Hinata is carried into a waiting van, where her rival Sena looks on. http://kissmanga.com/Ma...

Yona and Lili are taken in by an old woman at an inn, who serves them tea. Yona starts to suspect it's a trap. Lili suddenly falls unconscious, and it turns out the tea was drugged. Before Yona can react, the old lady chloroforms her. http://mangafyi.com/manga/2233/akatsuki-no-yona/chapter-111-chapter-111

Blonde girl with curly hair is chloroformed by an older woman. She wakes up in a room full of candles and skulls. Contributed by @IeonScans

A blonde haired girl in a leopard skin jacket is kidnapped by some thugs. Contributed by @IeonScans.

A character dressed as a nurse is gassed in the back seat of a car. She wakes up tied to a pole.

A redhead woman is given a drugged coffee while in a car. Not sure what this manga is about, but it's adult in nature. It's from Korea I believe. I spliced together some shots of her falling asleep. Source: http://kissmanga.com/Manga/Brawling-Go/ch-056?id=329880

Maria is captured and rendered unconscious off panel. She is later shown chained by her arms and feet. http://kissmanga.com/Manga/Mazinger-Angel-Z/Vol-002-Ch-008--The-Demon-Inside-the-Old-School-Building?id=147864

Miki is captured and shown unconscious. There are some nice scenes in this chapter.

Maria of the Mazinger Angels, is knocked out of her giant robo during a fight. The bad robot catches her unconscious. She gets rescued later on. I love the art of this manga! http://kissmanga.com/Manga/Mazinger-Angel/Vol-002-Ch-012--M-A--Base--Targeted-by-the-Devil?id=145037

Chikori is rescued by a magic user named Sumika Hoshikawa. Sumika dresses like a sexy cowgirl. Chikori was captured by an Orc. She is rescued and faints. http://kissmanga.com/Manga/Ultimate-Antihero/Ch-000--Prologue?id=242831

Ran Mouri is investigating a case, and trying to help locate a woman named Waka-San. Ran searches the apartment and finds Waka-San in the bathroom on the floor. Before Ran can do anything, she passes out. Later it's revealed the bathroom was filled with chloroform gas. Source: http://www.mangahere.co/manga/dete...