RT Journal Article SR Electronic T1 Muscle cramps: quinine derivatives likely to be effective but not recommended for routine use due to toxicity; vitamin B complex, naftidrofuryl and calcium channel blockers possibly effective JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 114 OP 115 DO 10.1136/ebm1090 VO 15 IS 4 A1 Young, Gavin YR 2010 UL http://ebm.bmj.com/content/15/4/114.abstract AB