A CVS spokesperson told ABC News they are 'aware of intermittent shortages of generic amphetamine medication in the supply chain,' adding their pharmacists 'will work with patients who are prescribed this medication as needed.' Major retail pharmacies like CVS and Walgreens have also noted supply chain constraints. The company said they are experiencing 'intermittent backorders' as 'there has been a significant rise in national prescription rates, this can cause some constraint to product availability.' Teva says disruptions will only be 'temporary' and expects inventory to recover within months.