These are sativa strains that have been cross pollinated by a breeder to fit special criteria such as exotic smells, tastes and the stimulant effects that sativas are known for. Often these hybrids contain some indica genetics but appear mostly sativa dominant in nature.
Hybrid sativa dominant strains are coveted as medicine for the motivational properties they possess, often without the paranoia associated with pure sativa strains. Sativa dominant strains are uplifting, energetic and have a “cerebral” high that is best suited for daytime smoking. These types have antidepressant and appetite stimulation qualities, and can be very valuable as medicine in that regard.
In terms of medical value these are the best and most widely appreciated. Today’s “Kush” strains are a prime example of these types and are easily the most popular. They tend to have many qualities that both grower and patient find to their liking, therefore the majority of medical marijuana is hybrid Indica. As a result of their higher CBD levels from breeding with Cannabis Ruderalis, they are also helpful as a sleeping aid for those suffering from injury, insomnia or severe inflammation.