The HSE says no patient received a potentially contaminated chemotherapy product after it was recalled.
The body's moved to clarify reports suggesting the drug had been used this week - after the health service was notified of an issue with it.
The HSE says it became aware of the situation - last Monday - and that immediate and co-ordinated action was undertaken by all oncology teams throughout the country to contact all 200 patients concerned.
In a statement it says it would like to categorically refute claims to the contrary in some media coverage today.
The HSE said once it became aware of the situation on Monday 11 October, "immediate and coordinated action was undertaken by all oncology teams throughout the country to contact all 200 patients concerned."
Fannin Compounding, a Dublin-based pharmacy, had issued a safety alert after one of it's machine used to manufacture the medicine was found to have been contaminated.
A bacteria which can cause potentially life-threatening gastro-intestinal infections was found in some batches of drugs during a routine test.
This is the third time in six months that Fannin Compounding has been at the center of precautionary product recalls.