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Hello from JustAnswer.
It is generally not a problem that he has taken a single extra dose of the Myfortis. There is a small risk of side effects because of the higher dose, but the vast majority of individuals that tolerate the twice a day dose without side effects will also tolerate the single extra dose without side effects.
Of course, if he were to be taking an extra dose on multiple occasions, there will be more o f an accumulation of the drug, so it would be wise to avoid these accidental extra doses, but an occasional single extra dose is much less risky.
So, there is no reason for you to be worried about this.
You are very welcome.