Alcohol and Calcium. 

Chronic alcohol consumption can impair the intestines’ ability to absorb calcium. This can lead to a decrease in the calcium levels in the body.

Alcohol can increase the risk of osteoporosis and fractures. Alcohol disrupts the function of osteoblasts, the bone-forming cells, which can reduce bone density over time.

 -    Alcohol affects the hormones related to bone health, the testosterone levels in men and estrogen levels in women. Decreasing both. 
Low levels of these hormones are associated with reduced bone density.

     - Alcohol can impair coordination and balance, increasing the likelihood of falls and subsequent fractures in individuals, especially the elderly.

 Drugs and Calcium.

   -  Corticosteroids,  known as steroid medicines, and long time use, can reduce calcium absorption from the intestines, increaseing its loss through the kidneys, leading to a risk of osteoporosis.

   -A few anticonvulsant medications can interfere with the vitamin D assimilation. Vit D is essential for calcium absorption, potentially leading to lower calcium levels.

   -Diuretics can lead to increased calcium excretion in urine, which also can contribute to lower calcium levels in the body.

    -Long-term use of PPIs for acid reflux may reduce calcium absorption from food, increasing the risk of fractures.

  If you are on any of these it is best to talk to your General Practioner. 

I have found a liquid calcium to be good and easier to absorb, but still consult your doctor.