Difficulty urinating (also known as urinary retention) can be described as the experience of a decreased ability to pass urine. This can be due to painful burning sensations within the urethra or a due to a loss of bladder control which prevents or inhibits one from urinating even with a full bladder. Difficulty urinating is often accompanied by other coinciding effects such as stimulation and constipation. It is most commonly induced under the influence of heavy dosages of stimulant and opioid compounds, such as heroin, fentanyl, kratom, amphetamine, MDMA, and 4-FA. However, it can also occur under the influence of stimulating psychedelics and deliriants.