Later on, Barr and Shire reached a settlement agreement permitting Barr to offer a generic form of the extended-release drug beginning in April 2009.In the United States, a labor shortage at Teva Pharmaceuticals caused a supply shortage of Adderall in 2022. Commercial formulation
Chemically, Adderall is a mixture of four amphetamine salts; specifically, it is composed of equal parts (by mass) of amphetamine aspartate monohydrate, amphetamine sulfate, dextroamphetamine sulfate, and dextroamphetamine saccharate. This drug mixture has slightly stronger CNS effects than racemic amphetamine due to the higher proportion of dextroamphetamine. Adderall is produced as both an immediate release (IR) and extended release (XR) formulation. As of December 2013, ten different companies produced generic Adderall IR, while Teva Pharmaceutical Industries, Actavis, and Barr Pharmaceuticals manufactured generic Adderall XR. As of 2013, Shire plc, the company that held the original patent for Adderall and Adderall XR, still manufactured brand name Adderall XR, but not Adderall IR. Comparison to other formulations
Adderall is one of several formulations of pharmaceutical amphetamine, including singular or mixed enantiomers and as an enantiomer prodrug. The table below compares these medications (based on US approved forms):

Legal status
In Canada, amphetamines are in Schedule I of the Controlled Drugs and Substances Act, and can only be obtained by prescription. In Japan, the use, production, and import of any medicine containing amphetamine are prohibited. In South Korea, amphetamines are prohibited. In Taiwan, amphetamines including Adderall are Schedule 2 drugs with a minimum five years prison term for possession. Only Ritalin can be legally prescribed for treatment of ADHD.
In rarer cases, virulent strains are also responsible for bowel necrosis (tissue death) and perforation without progressing to hemolytic-uremic syndrome, peritonitis, mastitis, sepsis, and Gram-negative pneumonia. Very young children are more susceptible to develop severe illness, such as hemolytic uremic syndrome; however, healthy individuals of all ages are at risk to the severe consequences that may arise as a result of being infected with E. coli.Some strains of E. coli, for example O157:H7, can produce Shiga toxin (classified as a bioterrorism agent). The Shiga toxin causes inflammatory responses in target cells of the gut, leaving behind lesions which result in the bloody diarrhea that is a symptom of a Shiga toxin-producing E. coli (STEC) infection. This toxin further causes premature destruction of the red blood cells, which then clog the bodys filtering system, the kidneys, in some rare cases (usually in children and the elderly) causing hemolytic-uremic syndrome (HUS), which may lead to kidney failure and even death. Signs of hemolytic uremic syndrome include decreased frequency of urination, lethargy, and paleness of cheeks and inside the lower eyelids. In 25% of HUS patients, complications of nervous system occur, which in turn causes strokes. In addition, this strain causes the buildup of fluid (since the kidneys do not work), leading to edema around the lungs, legs, and arms. This increase in fluid buildup especially around the lungs impedes the functioning of the heart, causing an increase in blood pressure.Uropathogenic E. coli (UPEC) is one of the main causes of urinary tract infections.