ADHD Meds Out of Stock

Hoping a fellow Houstonian can help point me in the right direction. I was recently diagnosed with ADHD, but finding a pharmacy to fill my prescription has been impossible. Doc. gave me a script for dextroamphetamine-amphetamine 5 mg and I can’t find it anywhere. Called 10 pharmacies today. Does anyone know where I can find it? If not, what are some alternative meds I can request from the doctor? Thanks in advance for any and all help!