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Question answered:08/01/09
We looked on eMC for the Summary of Product Characteristics (SPC) information.
On the SPC [1] it says:
“In phase III studies, over 4 years, nervous system disorders were reported with higher frequency in patients treated with strontium ranelate, compared with placebo: disturbances in consciousness (2.5% vs. 2.0%), memory loss (2.4% vs. 1.9 %) and seizures (0.3% vs. 0.1%).”
We searched using TRIP, Medline and Cochrane for any more evidence about strontium ranelate and either memory loss or seizures, and found three reports:
A 2007 Health Technology Assessment report [2] states:
"Some nervous system disorders, including mental impairment, disturbed consciousness, memory loss and seizures, were also more common in patients randomised to strontium ranelate."
This report was similar to others mentioned in a 2008 Br J Clin Pharmacol article [3] and a Cochrane Review [4]. In the case of the Cochrane review they reported that in trials memory loss occured in 2.4% of patients on strontium ranelate compared to 1.9% assigned to the placebo intervention.
References
1. eMC. SPC for Protelos, text last revised Sept 04.(http://emc.medicines.org.uk/emc/assets/c/html/displaydoc.asp?documentid=15410)
2. http://www.ncbi.nlm.nih.gov/pubmed/17280622
3. http://www.ncbi.nlm.nih.gov/pubmed/18754840
4. http://www.ncbi.nlm.nih.gov/pubmed/16856092
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