Voltaren Rapid (Ciba-Geigy)
25 mg and 50 mg tablets
Diclofenac has been available as a sodium salt for many years. The substitution of a potassium salt results in an earlier onset of action. After oral administration of a 50 mg tablet, the peak plasma concentration is reached in 20-60 minutes compared with an average of 120 minutes for diclofenac sodium. This new formulation has therefore been approved as a short-term treatment for the relief of acute pain states in which there is an inflammatory component and in the symptomatic treatment of primary dysmenorrhoea.
The adverse effects of diclofenac potassium resemble those of the sodium salt.