People with sexually transmitted infections are putting themselves at risk by buying treatments over the internet, say researchers.
The University of East Anglia found less than a quarter of internet vendors gave information on potential side effects of their treatments.
A similar number also failed to say if their products would interfere with prescription medicines.
The study features in the journal Biomedcentral Public Health.
The East Anglia team also found that few vendors offered advice on whether their products might harm patients who were breastfeeding or pregnant.
Less than a quarter of vendors provided advice on how to avoid transmission of the STI or becoming re-infected.
Source - BBC