For an example/instructions for an entry from MIMS Online, see p. 5 of Charles Sturt's APA 7th Referencing Summary, under the heading of Reference in a dictionary, encyclopedia, or thesaurus with a group author.

For an example/instructions for an entry in the Australian Medicines Handbook, see the Academic Referencing Tool (ART), at APA 7 > Other Sources > Drug information (Online).

You should use those as a guide:

• Use the corporate author (group author) as the entry point
• Use "n.d." as the year of publication and include a retrieval date
• Use the full URL of the page/article (copied from the browser address bar) as the retrieval information.

TWO FURTHER EXAMPLES:

MIMS Online reference:

MIMS. (n.d.). Anpec. In MIMS Online. Retrieved March 2, 2020, from https://www-mimsonline-com-au.ezproxy.csu.edu.au/Search/FullPI.aspx?ModuleName=Product%20Info&searchKeyword=anpec&PreviousPage=~/Search/QuickSearch.aspx&SearchType=&ID=130650001_2

In-text citation:

… (MIMS, n.d.)

AMH reference:

Australian Medicines Handbook. (n.d.). Atorvastatin. In Australian Medicines Handbook (Online). Retrieved March 2, 2020, from https://amhonline-amh-net-au.ezproxy.csu.edu.au/chapters/cardiovascular-drugs/drugs-dyslipidaemia/statins/atorvastatin

In-text citation:

 … (Australian Medicines Handbook [AMH], n.d.)