I have been having lowerbackpain for abt one year nd i hve been talking calcium tablets for everday i want knw if there is any side effect 4rm talking this tablets.

When you say 'much', what quantity are you talking about exactly? Unless your doctor says otherwise, it is not advisable to take more than 1,200mg of Calcium supplement a day as it can damage your kidneys and impair absorption of other nutrients like zinc and magnesium.
As for side effects of long term use, researchers found that it increased the risk of heart attacks in women of advanced age. I dont know about men.

thankyou so much on your reply,,by muchh I have bee taking the calcium tablets for six months now and I used to take the calcium tablets due to a GREEN WORLD BODY CHECKING MACHINE when i was diagonised 4 athrithis,and it said I had low calcium in my body and i take 2tablets a day 4 six months now, so am grateful but should i stop what of thhe medication

I am so sorry I did not see your reply on time.
The thing about calcium supplements is that they are of different types and some are more easily absorbed than others. Ca supplements also tend to get deposited in the body over time so sometimes it's best to decrease your intake as time goes on.
Please, please, please, if you can talk to a doctor about how you should take the drugs, do so. He/she will determine best what type of Ca supplement it is and how you should take it.