Police have visited the Shanghai office of British drugmaker AstraZeneca, as China intensified a crackdown on commercial corruption in the medical sector.

Amid a criminal investigation into another British pharmaceutical giant, GlaxoSmithKline, officers from Shanghai's Public Security Bureau are said to have detained a sales employee of AstraZeneca after visiting its sales office in Shanghai on Friday.

"We believe that this investigation relates to an individual case, and while we have not yet received an update from the public security bureau, we have no reason to believe it is related to any other investigations," a spokesman for the pharmaceutical company told The Telegraph on Monday, adding that the company "does not tolerate any illegal or unethical conduct in our business activities".

The drugmaker's China office could not be reached for comment on Tuesday.

Amid China's clampdown on commercial corruption in the medical sector, Glaxo-SmithKline is being investigated for an alleged bribery and drug pricing scandal, while Belgian drugmaker UCB said last week that local authorities visited its office in China.

The raid — in a sector where business insiders said bribery is very common — has aroused a stir in the industry.

A salesperson with Eli Lilly and Co, a US-based transnational pharmaceutical maker, said on Tuesday that there have been a lot of discussions among industry workers that it is a difficult time for foreign pharmaceutical companies and their workers, especially sales people.

"It's hard to see for now how the country's sudden brake on commercial corruption in the medical sector will affect each individual's sales performance, but we feel very dismayed," said the source, who asked to be anonymous.

"I don't understand why the foreign firms are singled out in the crackdown. We are definitely not the fundamental cause to generate the disorder in the medical sector or a main contributor in the strained relations between doctors and patients," he added.

The National Health and Family Planning Commission, on the other side, pledged to deepen the medical reforms.

A mechanism will be set up to replace the current practice of hospitals relying mainly on revenue from medicine, and a blacklist system will be improved for individuals and companies involved in bribery, Li Bin, the commission's minister, said recently.

Medical experts said the crackdown can deter corruption, but the fundamental solution relies on the separation between those who write prescriptions and those who select and purchase the medicine.

Liu Xianquan, dean of the Law School at East China University of Political Science and Law, said that it is the first time that China has come up with such powerful measures to fight bribery by foreign pharmaceutical makers, and the action can serve as a deterrent.

"Commercial corruption in the medical sector is so harmful that it not only pushes up the price of medicine, but also prevents doctors from prescribing the most effective medicine for a specific disease because doctors would opt for drugs promoted by those who paid bribes," he said. "The department responsible for medicine purchases should be independent from doctors and can only make the purchase under strict supervision."

Pricing investigation