Is it permissible to use marijuana as a treatment for epilepsy, based on a medical prescription, in cases where no other effective medications are available and without it resulting in equal or greater harm?

Consuming marijuana is forbidden because it is an intoxicant. However, it is permissible to use it for pain relief or to sedate a patient, provided certain conditions are met: necessity, a trustworthy doctor's certification of its benefit, limiting use to the extent of the necessity, the absence of a permissible or less prohibited alternative, and that it does not cause harm equal to or greater than the harm for which it is used, such as addiction. The Permanent Committee has issued a fatwa permitting the use of intoxicating medications like "pethidine" or "morphine" for pain relief when necessary, if no other permissible substances are available, provided that this does not result in greater or equal harm, such as addiction.