Quinate (Quinine/sulphate) used to be prescribed but it has come out of favour because of it's tendency to allow "Bruising" of skin by thinning blood. Drinking tonic water is an approved way to get quinine into the circulatory system in small amounts. Quinine is still available by prescription, but there are many safer alternatives for the treatment of leg cramps, including magnesium, stretching, and vitamin E, that should be exhausted before turning to this risky medication. The only approved medicinal use of quinine is for the treatment of malaria.
You could try taking two paracetamol (Panamax) tablets before retiring of a night. It works for me since Quinate no longer prescribed.

As mentioned, magnesium two tablets a day cured my restless legs and night time leg cramps.

So called restless legs can also be attributed to poor circulation which is a whole other story.

Quite true but worthwhile trying magnesium as it may assist and better than the alternatives if it does. Not an instant fix as it takes awhile to build up in your body

magnetic underlay made a difference

I have really severe restless legs i have tried all the above none worked for me i used restless legs relief when i relax in early evening plus at night i take Sifrol they work for me

Snap1046 Have you tried magnesium oil? You obtain it from the chemist, spray it on and rub it in. This has the properties of magnesuim but they think the action of the massage , when rubbing it in also helps. Good Luck :)