This is an excellent question, and the answer on CBD will take time, and it isn't black-and-white all-or-nothing. I mean, how long has it taken psych meds to get their reputation?? Antipsychotic meds don't get a great review on PubMed....
So let me add, as I have before, I DON'T work for CW Hemp (makers of Charlotte's Web). I'm a dad with a sz adult child.
We used CBD with varying degrees of success for 2 years. I'm not sz and I take 100mg. per day to fight depression, and 100mg. at night to nearly cure the neuropathy (nerve damage, sever pain) in my feet. It helps me focus, sleep and feel more hopeful.
We went from using 60mg.CBD /day -- to 650mg.CBD /day over a 14 month period.
It kept getting better until 300-500mg./day got worse. But 650mg/day was amazing (this is a known "modulated bell curve" of efficacy). Charlotte's Web is excellent and water soluble pure CBD worked even better. (Be careful, because not all CBD claiming to be water soluble is NOT. It has to go through more processing, so beware of claims!)
But here's what we found: most people can't keep consistent long enough to see the results they want. We don't expect SAMe or 5-HTP or Sarcosine to be a cure in 30 days, right? We don't expect insulin to cure us in 30, 60 or 90 days, right? Since doctors do not have a solid CBD prescription protocol, WE have to figure out the dose, and the brand and incorporate that with pharma norms. GW Pharma probably has their hands full. Give it time.
The answer to your question is probably that CBD may or may not be a "single" remedy for sz. Dr. Daniele Piomelli at UCI in California thinks it will be, but much work is needed to get the definitive answer.
In two years I've not met one person who has experienced any of those side effects. Dr. Piomelli used pure pharma grade CBD. No THC. (His study ends up using 800mg. CBD/day. Oh, and it's clinical shown to be safe up to 1,500mg./day.) Charlotte's Web Advanced potency has 50mg. CBD and 1.8mg. THC per 1 mL. serving. Does including cannabinoids other than CBD help or hinder? Unknown right now.
NOT CBD. My son slept better, but had no lethargy, dizziness, weight gain, brain fog during daytime ever. I sleep better using it, but for it helps me focus in daytime. CBD is a known "wake-inducing compound" according to this study.
They are indeed focused on epilepsy. But high-quality CBD is available and SHOULD NOT be blown off entirely just because GW doesn't have it first priority. Maybe they have huge hurdles just to get it on the market for epilepsy. Disclaimer: there also is low-quality CBD out there too, and either way, it's not cheap. If you don't think it's helping you, it's key that you are CERTAIN about the product you're trying. Some hemp from China can have impurities from the soil and mess with anything you might be sensitive to. Insist on organically grown. Charlotte's Web is made in an FDA-certified lab. It's clean and reliable.
The CBD molecule is the same, no matter where it comes from, or it's just not CBD! But Charlotte's Web is a full plant extract and has lots of cannabinoids. Again, I don't work for CW Hemp. I've used 99.9% pure dharma-grade CBD and it worked even better. Some like the cannabinoids, some like the pure stuff.
Don't give up!!! And don't put all your eggs in one basket! There are plenty of studies, and you see many of the same scientists working on this stuff. THEY aren't giving up!!!! They are on your side! Here's a few of the newer studies....
Neurosci Biobehav Rev. 2017 Jan
Front Pharmacol. 2016 Nov 8
J Clin Psychopharmacol. 2016 Dec
Transl Psychiatry. 2016 Oct 18
Although all current antipsychotics act by interfering with the action of dopamine at dopamine D2 receptors, two recent reports showed that 800 to 1000 mg of cannabidiol per day alleviated the signs and symptoms of schizophrenia, although cannabidiol is not known to act on dopamine receptors.
Be comprehensive in your quest. Here's another maybe breakthrough?
How about autoimmune disease and GLUTEN causing brain fog, MS, mood swings and more? Not everyone who has sz -- ONLY has sz! OTHER factors can be at play. We are complex creatures! http://bipolarhealthgroup.org/index.php/healthy-brain-support-and-nutrition-care/
Keep up the quest!