A woman is chloroformed.

Magik and Storm are blasted into unconsciousness by the young mutant Sapna.

Haste (Martin Helling) from the Freedom Force takes down the X-Men leader Storm before she can use her powers.

Storm is defeated by the drugged feathers of Archangel.

Storm is knocked out cold with a blow to the head by Smokescreen.

Cassandra Cain and Superboy are drugged and captured by Doctor Sin. The villain try to drown them, but obviously they are able to escape the deathtrap.

 Storm receives an invitation to dinner at the Hellfire Club by Shinobi Shaw and a bouquet of roses drugged with a sort of neuro toxin. Despite the drug-induced manipulations, Storm refuse to join the Hellfire Club, so Benedict Kine plays her nervous system, sending her agony. Later Ororo awakes tied to a chair. 

Jean Grey and Storm appear unconscious on the cover. The villainess Cancellator elbows Storm in the face knocking her out.

Chloroform scene from a French graphic novel. Found on the Western Civilization Forum.

The organization "the Five" has defeated the future Justice League (their Flash is a women). Source: ComicOnlinefree.com

Green Lantern knocks out the reality warper Locus. Source: ComicOnlinefree.com

Pandora falls unconcious after a battle against Agent Kincaid and Vandel Savage. Source: ComicOnlinefree.com

Batman zaps Poison Ivy Source: ComicOnlinefree.com

In a fight, Mary Jane Watson is knocked out by a thug when he hits her in the head with a gun. Arriving just in time, Spiderman defeats the thug and carries the unconscious damsel to safety. Source: https://readcomiconline.to/Comic/The-Amazing-Spider-Man-1963/Issue-640?id=4856

Hush kidnaps the Bat Family. Source: ComicOnlinefree.com

A pass out and drowning from the Abigail story. Original published as Les Mythics #4

Lady Jaye is knocked out when she shoots a gas tank in her father's lab.

Doctor Aphra gets tranqed.

Quick chloro scene from the Dune Graphic Novel.

Storm is brutally knocked out during a fight against Valkyrie, and saved from drowning by her enemy who leaves her unconscious on shore.