A stable, aqueous, hydrochloric acid-containing solution of cis-platinum, suitable for injection, is provided, which contains no more than 1.0, preferably no more than 0.6 mg/ml of cis-platinum and sodium chloride in an amount of 0.4-1%, has a pH of 3-5 and is substantially free of other ingredients. Also a process for preparing such a solution is provided, wherein the cis-platinum is dissolved in a solution of the sodium chloride in a part of the water, the pH of this solution is adjusted to the desired value with the aid of hydrochloric acid, and the solution is then diluted with water to the desired concentration.
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