U.S. senators Susan Collins (R - ME) and Claire McCaskill (D - MO)-- the committee's chairwoman and ranking member — have reached out to Pfizer ($ PFE), Mylan ($ MYL), Amphastar ($ AMPH), Adapt Pharma and Kaleo, asking them to account for their pricing moves on the med, the cost of which has been heading north
alongside opioid abuse and overdose rates.