It closed down more than 5 per cent at $2.29 yesterday.
About 52 per cent of the company's revenue is in US dollars and it has extensive currency hedging facilities in place.
In US dollar terms, F&P Healthcare's respiratory and acute care product group operating revenue increased by 18 per cent over the year. The obstructive sleep apnoea product group's revenue increased by 7 per cent over the previous year.
Each group is responsible for about half the company's revenue.
Matt Goodson, portfolio manager at BT Funds Management, said F&P Healthcare's share price had fallen on the back of the decline in mask sales.
"The result itself was just okay, and perhaps a little disappointing relative to some broker forecasts."
The company announced a final dividend of 7c a share, unchanged from the previous year.