The "speedball" can use morphine as the opioid component, which is combined with cocaine, amphetamines, methylphenidate, or similar drugs. "Blue Velvet" is a combination of morphine with the antihistamine tripelennamine (Pyrabenzamine, PBZ, Pelamine) taken by injection, or less commonly the mixture when swallowed or used as a retention enema; the name is also known to refer to a combination of tripelennamine and dihydrocodeine or codeine tablets or syrups taken by mouth. "Morphia" is an older official term for morphine also used as a slang term. "Driving Miss Emma" is intravenous administration of morphine. Multi-purpose tablets (readily soluble hypodermic tablets that can also be swallowed or dissolved under the tongue or betwixt the cheek and jaw) are known, as are some brands of hydromorphone, as Shake & Bake or Shake & Shoot. Morphine can be smoked, especially diacetylmorphine (heroin), the most common method being the "Chasing The Dragon" method. To perform acetylation to turn the morphine into heroin and related drugs immediately prior to use is known as AAing (for Acetic Anhydride) or home-bake, and the output of the procedure also known as home-bake or, Blue Heroin (not to be confused with Blue Magic heroin, or the linctus known as Blue Morphine or Blue Morphone, or the Blue Velvet mixture described above). Access in developing countries
Although morphine is cheap, people in poorer countries often do not have access to it.
Additionally, tumors and kidney stones can block the urethra. Spinal cord injuries or nervous system disorders are additional causes of overflow incontinence. In men, benign prostatic hyperplasia (BPH) may also restrict the flow of urine. Overflow incontinence is rare in women, although sometimes it is caused by fibroid or ovarian tumors. Also overflow incontinence can be from increased outlet resistance from advanced vaginal prolapse causing a "kink" in the urethra or after an anti-incontinence procedure which has overcorrected the problem. Early symptoms include a hesitant or slow stream of urine during voluntary urination. Anticholinergic and NSAIDs medications may worsen overflow incontinence. Criticism
The concept of overflow incontinence has been criticised, because it is difficult to define and because the definitions that have been proposed have little clinical significance. The concept is a purely theoretical one that is not based on evidence. Overflow incontinence cannot be measured and can therefore not be reliably diagnosed. In the urological literature and in medical care the concept is therefore of little importance, with the related concept of chronic urinary retention being the much more relevant and useful one.In 2017 the Quality Improvement and Patient Safety (QIPS) committee of the American Urological Association (AUA) published a definition of nonneurogenic chronic urinary retention as a post-void residual of greater than 300 mL that was measured at least twice and extended over a period at least six months. Measurement of post-void residual by medical ultrasound is an easy procedure that is sufficient in most cases.