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Prazosin, trade names Minipress, Vasoflex, Pressin and Hypovase, is  used to treat high blood pressure and anxiety, PTSD, and panic disorder. It is an alpha-adrenergic blocker that is specific for the alpha-1 receptors. These receptors are found on vascular smooth muscle, where they are responsible for the vasoconstrictive action of norepinephrine. They are also found throughout the central nervous system. As of 2013, prazosin is off-patent in the US, and the FDA has approved at least one generic manufacturer.

In addition to its alpha-blocking activity, prazosin is an antagonist of the MT3 receptor (which is not present in humans), with selectivity for this receptor over the MT1 and MT2 receptors.

Quote "Prazosin is also used in treating urinary hesitancy associated with prostatic hyperplasia, blocking alpha-1 receptors, which control constriction of both the prostate and urethra.....This medication has been used to treat severe nightmares in children and people with PTSD symptoms. .... It is being considered as a pharmacologic treatment for alcohol dependence after a 2009 pilot trial was completed.  The drug is also recommended for severe stings from Indian Red Scorpion Hottentotta tamulus in Indian Subcontinent"

On Aug, 23, 2015: 302 people reported to have side effects when taking Prazosin hydrochloride. Among them, 3 people (0.99%) have Hallucination.