For me, large doses of cannabis has at times, have caused itching. Some strains seem to cause more itching than others.
If it is a passing itch that goes away after a few hours, or even a day, it is likely just an annoying itch. Drinking more water, or taking a bath often helps. If the itch persists, see a doctor. If you are itchy, if you have low energy or if you have signs of jaundice, avoid alcohol. Most drugs have some effect on the liver. The liver is what cleans our blood. Always a good idea to seek proper medical guidance, when it involves the liver.
The medical advice I was given regarding cannabis dosing was to keep it under 2g/day at a maximum. That was the maximum. A good target is 1g/day. Measure out 1g at the start of the day, and go from there. Along with that, came the usual doctor chatter about tolerance, abuse, and spending life in a haze. Don't drink alcohol or take benaydryl with the weed, trying maximize the high. Keep notes, note the effects, and then discuss with the medical expert. Don't chase the dragon; there is a big difference between medicinal and recreational use.
Poor liver function, or a stressed liver can cause pruritus.
Itching (pruritus) is one symptom of chronic liver disease, though not everyone with liver disease develops it. Learn what causes this itching, why you should see a doctor, and how to find relief.
www.healthline.com
Drink water, take magnesium. Weed, antidepressants, and other drugs can leach magnesium, potassium, and mess up electrolytes. Eat bananas, drink Gatorade, or take a supplement. Being magnesium deficient can affect mood disorders, sleep, and other things. Talk to someone who knows about nutrition, not just a regular MD. Not all doctors really understand nutrition, but that is just my opinion. A nutritionist, or medical doctor trained in nutrition, or a reputable natural health professional may be a better bet.
Robert-in-YEG