The characteristics of the behaviors associated with stealing could result in other problems as well, which include social segregation and substance use. The many types of other disorders frequently occurring along with kleptomania usually make clinical diagnosis uncertain.There is a difference between ordinary theft and kleptomania: "ordinary theft (whether planned or impulsive) is deliberate and motivated by the usefulness of the object or its monetary worth," whereas with kleptomania, there "is the recurrent failure to resist impulses to steal items even though the items are not needed for personal use or for their monetary value." Cause
Psychoanalytic models
Many psychoanalytic theorists suggested  that kleptomania is a persons attempt "to obtain symbolic compensation for an actual or anticipated loss", and feel that the key to understanding its etiology lies in the symbolic meaning of the stolen items. Drive theory was used to propose that the act of stealing is a defense mechanism which serves as to modulate or keep undesirable feelings or emotions from being expressed. Some French psychiatrists suggest that kleptomaniacs may just want the item that they steal and the feeling they get from  theft itself. Cognitive-behavioral models
Cognitive-behavioral models have been replacing psychoanalytic models in describing the development of kleptomania. Cognitive-behavioral practitioners often conceptualize the disorders as being the result of operant conditioning, behavioral chaining, distorted cognitions, and poor coping mechanisms. Cognitive-behavioral models suggest that the behavior is positively reinforced after the person steals some items.
Verteporfin (trade name Visudyne), a benzoporphyrin derivative, is a medication used as a photosensitizer for photodynamic therapy to eliminate the abnormal blood vessels in the eye associated with conditions such as the wet form of macular degeneration. Verteporfin accumulates in these abnormal blood vessels and, when stimulated by nonthermal red light with a wavelength of 689 nm in the presence of oxygen, produces highly reactive short-lived singlet oxygen and other reactive oxygen radicals, resulting in local damage to the endothelium and blockage of the vessels.Verteporfin is also used off-label for the treatment of central serous retinopathy. Administration
Verteporfin is usually injected intravenously into the largest arm vein. It is injected at a dose of 6 mg/m2 and light-activated. It is usually is given 15 minutes before laser treatment. This dose can be repeated 4 times per year. Contraindications
Porphyria. Side effects
Most common side effects are blurred vision, headache, and local effects at the injection site. Also, photosensitivity; it is strictly advised to avoid exposure to sunlight and unscreened lighting until 48 hours after verteporfin administration.Dogs and rats have been treated with inactivated daily doses 32–70 times higher than the dose advised for humans. The 4 weeks of treatment resulted in mild extravascular hemolysis and hematopoiesis in the animals. Interactions
Verteporfin is known to interact with the herbal remedy feverfew (Tanacetum parthenium), the latter of which seems to act as an antagonist to verteporfin for unknown reasons.