Asked how much, she responded: "double the price."
The AGs allege that Sun then also started increasing the price of its nystatin.
A Sun spokesperson told Business Insider in a statement that it believes the lawsuit's allegations are "without merit and will continue to vigorously defend against them."
AGs allege Heritage's former president told a colleague to 'jack it up'
Generic drugmakers were also in touch with each other about other chances to raise prices, according to allegations in the complaint. The suit claims that in 2014, a Sun employee told Heritage about a temporary decision to stop manufacturing the antibiotic paromomycin.
Heritage controlled a majority of the market share for the antibiotic, according to the complaint, and Sun was its only competitor back then.
"Need price increase to go immediately. Jack it up," Heritage's Malek allegedly said to another Heritage employee.

Shayanne Gal / BI Graphics

The labyrinthine complaint alleges activity going back at least as far as 2012. Midway through that year, Teva had just stopped making the generic drug nimodipine, according to the complaint, leaving just two manufacturers: Heritage and Sun's Caraco division.
Nimodipine was a major product for Heritage, according to the complaint. When Heritage's Malek asked an employee to reach out to Sun, the suit alleges, the employee learned that the drug wasn't a big product for Sun, and Sun was satisfied with its position.
Heritage allegedly pressed on. With a drug distributor proposal in play and an industry event coming up, "the timing is critical if we want to raise our pricing everywhere," the complaint alleges a Heritage employee emailed to Malek.
"So we will increase the price, you should tell them that so they can do the same without any [competition]," Malek allegedly emailed back later in the exchange.
The complaint claims that the two companies eventually did come to an understanding on pricing, with both taking major increases.
When, later in 2012, Heritage allegedly heard that Sun might have to recall the same product, nimodipine, the complaint claims that a Heritage employee was eventually able to confirm it with her Sun contacts in mid-April of 2013.
"Great feedback, time for next increase!" Malek is quoted as saying in response. About a week later, the complaint claims he added instructions to keep coordinating with Sun, "to make sure if/when they are back they talk to us first so we can be smart about it."
Employees at rival companies allegedly spoke directly about how they were approaching customers, complaint says
The group of attorneys general also claim that Heritage and the Indian drugmaker Dr. Reddy's Laboratories collaborated to increase the price of the drug meprobamate in 2013, when they were the only two manufacturers of the generic treatment for anxiety, tension and insomnia.
"We don't want to make any waves and we are not looking for additional share, just want to maintain what we have at a minimum of a 4x price," the complaint alleges Malek said, asking two employees if they wanted to get in touch with Dr. Reddy's.

Shayanne Gal / BI Graphics

Dr. Reddy's had been thinking about increasing its price too, the complaint alleges, but it didn't have enough of the product, according to communications cited in the complaint.
The complaint alleges that, to show its commitment to the agreement, Malek told a Heritage employee that he recommended "letting the market dry up a bit… We are taking the price up asap everywhere else."
Both companies then increased their prices around the same time, Heritage in April of 2013 and Dr. Reddy's in May, the group of 45 states further claimed.
(A Dr. Reddy's spokesperson told Business Insider that the company prefers not to comment on ongoing litigation.)
Heritage tried similar tactics with Mylan for the drug Doxy DR, an antimicrobial for severe acne, for which Mylan was its sole competitor, the complaint alleged.
The state AGs also claim the now-former Heritage CEO Jeffrey Glazer told Mylan President Rajiv Malik that the company's reaction to Heritage's bid for an unnamed "very important large retail pharmacy account" would "set the tone of whether this is a high priced item or more erosion."
Mylan ended up submitting a bid to the pharmacy that was only $10 lower, and Heritage ended up the pharmacy's sole supplier of Doxy DR, according to further allegations.
Heritage and Mylan kept working together to keep the price of a drug high, according to the complaint
The two companies kept working together to keep the price of Doxy DR high, according to the complaint. The complaint alleges that this became tricky when competing for customer accounts. Specifically, it claims that, after competing for a large account in fall 2013, Heritage's Malek emailed Glazer, referring to Mylan's president: "We should reach out to rajiv [sic], we need one more account and we are done."
But, the complaint further alleges, Glazer wrote back that the two of them had to be careful not to disrupt their agreement with Mylan— and in fact, Heritage allegedly ended up not pushing it with that large retailer.
"We need to look at our market share, current biz and pricing with and without [the one large account at issue] and make a decision," the complaint alleges Glazer emailed to Malek. "You don't want them retaliating and lowering prices at other accounts."