Los = batch

Example:

"Batch recall of pharmaceutical products

Urgent Medicine Recall. This refers to medicines for human use that are licensed medicinal products as defined in the Medicines Act 1968, and which are withdrawn or recalled from sale or supply for safety, quality or efficacy reasons."

http://209.85.141.104/search?q=cache:-ORac13S-QsJ:www.abpi.o...

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Note added at 29 mins (2008-08-18 18:56:24 GMT)
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More examples:

"June 01, 2007
MHRA orders batch recall of AstraZeneca's Casodex after counterfeit revealed
by Alison Fischer

The UK's Medicines and Healthcare Products Regulatory Agency issued a drug alert and recalled a batch of AstraZeneca's prostate cancer drug, Casodex (bicalutamide), after counterfeit product was discovered in the supply chain.

A criminal investigation has been launched and the recall was issued to minimise the risk to patients, the agency noted in a statement. The MHRA added that there has been "no evidence" of adverse reactions related to the counterfeit product at this time. Meanwhile, AstraZeneca specified that it is "currently investigating with the MHRA and [has] asked for the recall of that one batch."

http://www.firstwordplus.com/Fws.do?articleid=3F324C2B421A42...

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COMPILATION OF COMMUNITY PROCEDURESON INSPECTIONS AND EXCHANGE OFINFORMATION

PUBLISHED ON BEHALF OF THE EUROPEAN COMMISSIONBY EMEA (EUROPEAN MEDICINES AGENCY)

3. Definitions
Suspected defective product. A medicinal product about which a report has been received suggesting thatit is not of the correct quality, as defined by its Marketing Authorisation.

Batch recall.
The action of withdrawing a batch from the distribution chain and users. A batch recall maybe partial, in that the batch is only withdrawn from selected distributors or users.

Rapid Alert.
An urgent notification from one competent authority to other authorities that a batch recallhas been instituted in the country originating the rapid alert. The procedure for issuing rapid alerts isdefined in the Compilation of Community Procedures, May 2001"

http://209.85.141.104/search?q=cache:_i7JZpd56u0J:www.emea.e...

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Here is a page from Google books (text can't be copied and pasted), The Textbook of Pharmaceutical Medicines, about batch recalls:

http://books.google.com/books?id=8LpTd-Lh_nYC&pg=PA822&lpg=P...