Keisse positive on two substances?

Iljo Keisse may be facing double trouble, as apparently he tested positive for two substances on the last day of the Gent Six Day race. One is said to be cathine, while the other is still unnamed.

Keisse, Topsport Vlaanderen team doctor Daniël De Neve and soigneur Robert D'hont all confirm that Keisse was suffering from a cold before the start of the Six Day, for which the doctor gave him medication, none of which contained the forbidden substance. However, the product is contained in many over-the-counter medications. Later during the race Keisse came down with intestinal problems and took Immodium, which should not have caused the positive samples.