[lemma=could] [□] □ □
[lemma=could] [□=□] □ □
[lemma=could] [□ & □] □ □
" Greater numbers of seriously ill patients could get experimental medicines under proposed federal guidelines released Monday that also would clarify when drug companies could charge for the medicines . All told , between existing stockpiles , private sector supplies and production capabilities , the FDA estimates there could be enough medicine to treat tens of millions of people through the heart of flu season .