Several alleged victims who told an Ottawa court they were surreptitiously drugged and then sexually assaulted were likely given either GHB — commonly known as the date-rape drug — or the anesthetic ketamine, an emergency department doctor testified Monday.

Philip Wilson, 33, has pleaded not guilty to 45 charges including sexual assault, aggravated assault, and administering a noxious drug in relation to 14 different women over a period of time between 2014 and 2015.

Police and Crown prosecutors maintain there are 14 women who allege they were drugged without their permission and sexually assaulted. Most had photographs and videos taken of them in sexually explicit poses, the Crown contends.

During the trial more than a dozen witnesses — mostly women who worked in the ByWard market — told the court Wilson invited them to party with him and his girlfriend in his apartment where in some cases they drank and took drugs like cocaine and MDMA, also known as ecstasy.

But a review of their medical records and videos of the alleged victims seized from Wilson's cellphone suggest other drugs were at play, according to Dr. Kari Sampsel an emergency department physician and the medical director of the sexual assault and partner abuse program at the Ottawa Hospital.

In her capacity as an emergency room doctor, Sampsel says she has treated many drug overdose victims, including those who consumed cocaine, ecstasy, gamma hydroxybutyrate (GHB) and ketamine, an anesthetic known on the street as "Special K."

Sampsel told Assistant Crown Attorney Anya Kortenaar that during a cocaine overdose a person is usually agitated, displays a rapid heart rate, a high body temperature, flushed face, and possibly seizures could take place.

When asked about an MDMA overdose, Sampsel said the effects would be similar to that of cocaine with the addition of bruxism, which is the clamping down of the jaws to the point of grinding teeth back and forth.

From reading files and observing behaviours on the video, Sampsel told the court there was likely "another drug on board" to explain why the women were left unconscious — something she said isn't likely to happen with an MDMA or cocaine overdose.

Several witnesses also reported that shortly after they drank a drink Wilson had handed them, they passed out or could no longer remember what happened next.

Kortenaar put to the physician what she described as"hypothetical scenarios" of whether the alleged victims were under the influence of a drug other than the ones they admitted voluntarily taking while partying at Wilson's apartment.

Sampsel said while high levels of alcohol, cocaine and MDMA could cause some memory loss - it is more likely the women who said they suffered memory loss and were unconscious for more than eight hours were likely given ketamine or GBH.

In one women's case, Sampsel listened to her 911 call looking for medical help and examined the videos found on Wilson's phone.

"She seemed to be sedated, drowsy, in a dream-like state with slurred, slow speech." said Sampsel. "The sudden onset of memory loss indicates GHB intoxication."

In another video of a suspected GHB overdose the woman displayed a a loss of muscular tone in her face, a typical symptom of the drug and indicative of "fairly significant sedation" Sampsel testified.

The physician told the court ingesting large amounts of ketamine and GHB can also cause a person to lose control of their bladder and bowels, which several of the alleged victims experienced while at Wilson's apartment.

Police seized ketamine, ecstasy, marijuana, cocaine and one vial which tested positive for GHB and several water bottles with GHB in them from Wilson's home.

During cross examination, Sampsel admitted to defence lawyer Trevor Brown that excessive alcohol, which some of the women admitted drinking, could explain the slurred speech, memory loss and incontinence.

The Crown said it likely won't call any more witnesses but will make submissions on Thursday, when the trial resumes.

Defence counsel told the court his client will take the stand in his own defence.