$60 per cartridge, equivalent to 2.5 grams of medical cannabis. Its potent psychoactive effects are clearly detectable in both mind and body, delivering a fusion of cerebral euphoria and physical relaxation. While your thoughts may float in a dreamy buzz, your body is more likely to find itself fixed in one spot for the duration of GDP’s effects. Like most heavy indica varieties, Granddaddy Purple is typically pulled off the shelf to treat pain, stress, insomnia, appetite loss, and muscle spasms.