CVS Gave Kids Cancer Drugs by Mistake 50 families were supposed to get fluoride tablets By Mark Russell, Newser Staff Posted Mar 5, 2012 5:02 AM CST 11 comments Comments CVS hasn't offered any explanation for the mixup. (AP Photo/M. Spencer Green) (Newser) – Children from 50 families in New Jersey were accidentally given a breast cancer drug instead of chewable fluoride tablets, reports Gawker. Instead of a fluoride pill to prevent tooth decay, the children got Tamoxifen, a drug that prevents the production of estrogen. Fortunately, doctors say it should not have any serious effects when used for a short time. CVS spotted the error and notified the families, but has no explanation for the mix-up.