The authority said that they have taken the decision after receiving complaints "against immoral/indecent content" on the app.
The state regulator said Friday that it had repeatedly instructed the platform to tighten its content monitoring to block access to the "unlawful" material.
Donald Trump has said the app's data gathering is a security threat and is trying to ban it from the US.
However, the company failed to fully comply to the asked instructions.
"However, TikTok has been informed by the Authority that we are open for engagement and will review the decision subject to a satisfactory mechanism by them to moderate unlawful content, as we understand that banning the application is not a permanent solution", said Mehran.
The TikTok app went completely blank all across Pakistan within minutes of the PTA's announcement.
In June, the app was put on "final notice" over its alleged failure to remove what the Pakistani government called "obscenity, vulgarity and immorality".
Shortly after the ban, the app began to show a blank interface with no text or images loading.
TikTok has around 850 million worldwide users, but it has become a victim of growing tensions between China and America.
In July, Pakistan's telecommunications regulator issued a "final warning" to the short-form video app over explicit content posted on the platform.
Muslim-majority Pakistan has media regulations that adhere to conservative social customs.
Pakistan Prime Minister Imran Khan has also reportedly taken a keen interest.
Usama Khilji, director of Bolo Bhi, a Pakistani group advocating for the rights of internet users, said the decision undermined the government's dreams of a digital Pakistan. Despite it being the app's 12th largest worldwide install market, it was previously the target of the Pakistan Telecommunication Authority, which banned dating apps like Tinder and Grindr for the same reason.
Almost 89% of TikTok's total September revenue was from China where it is known as Douyin, followed by 6% from the US and 1% from Turkey, the statistics showed.