Websites selling prescription medicines have been reprimanded by inspectors for compromising patient safety.
The Care Quality Commission highlighted lax standards at four online pharmacies in its latest batch of inspections.
It included one case where a patient's application was assessed in only 17 seconds by a GP.
Another pharmacy was criticised for prescribing a "high volume" of opioid-based medicines without properly checking patient histories.
Other issues identified by inspectors included insufficient checks on patients' identity, poor recording of medical histories, inappropriate medicines being prescribed and lack of communication with the patient's GP.
There were also examples of patients needing further assessment and not being referred to the appropriate service.
In particular, the CQC found:
- Doctor Matt Ltd was issuing prescriptions after taking as little as 17 seconds to review patient questionnaires. Its registration to operate has been suspended for six months
- Frosts Pharmacy Ltd was found to be prescribing large quantities of inhalers for asthma without checking if the patient's condition was out of control or if a diagnosis had been confirmed
- White Pharmacy Ltd was prescribing a high volume of opioid-based painkillers with no system in place to confirm patients' medical or prescribing histories. Its ability to prescribe these medicines has been restricted
- i-GP Ltd was issued requirement notices instructing it to make improvements in a number of areas, including around ensuring it has a robust system in place to verify the identity of its patients
Prof Steve Field, who is in charge of the CQC's online pharmacy inspection regime, said online providers must not compromise safety.
"We expect the same standards of quality and safety to be met as we would see in more traditional GP settings - this is exactly what people deserve," he added.
The CQC is in the process of inspecting all 46 online pharmacies which are registered in the UK.
It comes after a BBC investigation last year highlighted problems with the online pharmacy market.
The BBC approached the four pharmacies highlighted by the CQC for a comment. Only two made a statement.
Angus Wrixon, director of Doctor Matt, said patient safety had "always been our priority".
"Interactions may last only a few seconds, for example, when a known customer is requesting a repeat prescription - as is the case in many normal GP consultations," he added.
Stuart Gale, owner and chief pharmacist at Oxford Online Pharmacy, which is run by Frosts, said: "We have responded immediately, even suspending our asthma inhaler service for the time being so that we can ensure we are operating to the highest standards."
Last month the CQC published its finding on two pharmacies and warned patients to take care when using website-based prescribing.
The tips for things for the public to check before they click and buy are:
- An online doctor service is registered with the CQC or, if an online pharmacy service, with the General Pharmaceutical Council using the EU common logo
- Their address and where you can contact them
- How much the service will cost
- Who works there - are they based in the UK or overseas and are they registered?
- You have been given clear information about the medicine prescribed