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Abdullah said K. Sharmilah, a government toxicologist, told the court Wednesday she examined the drug along with several other samples provided by police.
"If you know someone is coming after you with a nerve agent, atropine is a key drug you would want to carry," said Nial Wheate, a senior lecturer in pharmaceutics at the University of Sydney.
In addition to the antidote, Kim was also carrying $125,000 in cash at the time of his death, a police officer previously testified in court.
Abdullah said the court heard Kim was carrying atropine in tablet form, but Bernama reported he had "glass vials" of the drug.
Poisoned
Kim was allegedly poisoned with VX while on his way back to his home in the Chinese territory of Macau.
Security footage showed two women, 25-year-old Indonesian Siti Aisyah, and 29-year-old Vietnamese citizen Doan Thi Huong, walking up behind Kim and rubbing their hands on his face. Abdullah is the lawyer for Doan.
Malaysian authorities claim the pair were trained by North Korean agents to swab Kim's face with the nerve agent. They have pleaded not guilty to murdering Kim, saying they were duped into thinking they were participating in a prank TV show.
North Korea has repeatedly denied any involvement in the assassination of Kim.
Soon after he was poisoned with VX, he stumbled into a clinic in the airport and requested medical attention.
A nurse wiped a "odorless, water-like" fluid from Kim's face, as his blood pressure spiked to a "life threatening level," according to a doctor who testified in court.
Shortly after entering the clinic, Kim developed a seizure. The 45-year-old was rushed to hospital but died in the ambulance en route.
The antidote
According to ASHP, atropine is most commonly injected into a muscle, under the skin, or administered intravenously, but is also available in pill form or as eye-drops. While it can be used as an antidote, the drug is also used to treat muscle spasms and reduce airway secretions.
It's marketed under a number of brand names, including Sal-Tropine, AtroPen, and Atreza.
Wheate, at the University of Sydney, said that atropine's effectiveness against a fast-acting nerve agent like VX depended on how it was delivered.
"If you're carrying it as a tablet or a liquid that you're intending to swallow is not going to do you any good," he said.
"If you swallow it as a tablet it's going to take anywhere from 15-20 minutes until it gets into your bloodstream and by that stage the VX is going to have (taken effect)."
"Individuals should not rely solely upon antidotes ... to provide complete protection from chemical nerve agents," the company warns. "Decontamination of the poisoned individual should occur as soon as possible."
Living in fear
The presence of antidotes on Kim's person at the time of his death adds another twist to a case which dominated headlines worldwide.
Exiled from North Korea since he fell out of favor with his father, Kim Jong Il, the victim lived for the most part in Macau, a special administrative region of China near Hong Kong.
According to a South Korean lawmaker, citing a National Intelligence Service briefing, Pyongyang had been attempting to assassinate Kim Jong Nam for five years before the incident in Malaysia. A North Korean man jailed for spying in South Korean in 2012 reportedly said he had been ordered to kill Kim.
Retracing their steps
The two women accused of administering the deadly nerve agent have consistently denied knowledge of the plot, saying they thought it was for a TV prank show.
Aisyah's lawyer, Gooi Soon Seng told reporters in a press conference that the purpose of the visit was to get a clearer picture of what happened on February 13 and determine the different routes taken by Kim and the two suspects.
According to Malaysian state media, police efforts to track down three other suspects involved in the case have been unsuccessful.
The trial, the highest profile in Malaysia for quite some time, is expected to continue into next year.
CNN's Paula Newton, Josh Berlinger and Euan McKirdy contributed reporting.