Rapid responses are electronic comments to the editor. They enable our users to debate issues raised in articles published on bmj.com. A rapid response is first posted online. If you need the URL (web address) of an individual response, simply click on the response headline and copy the URL from the browser window. A proportion of responses will, after editing, be published online and in the print journal as letters, which are indexed in PubMed. Rapid responses are not indexed in PubMed and they are not journal articles. The BMJ reserves the right to remove responses which are being wilfully misrepresented as published articles.
Searching PubMed for gentamicin in title or abstract yields 22000 hits, and gentamycin yields 2200. Searching for gentamicin AND gentamycin yields 200, so authors are sometimes not consistent even within their own abstracts. I have just found an abstract containing amitriptyline, amitryptyline, and amitryptiline; but I leave it to someone else to cover all the combinations from the authors' table of possible spellings. There should be time to submit for the next Xmas BMJ.