Any Disadvantages to Dual Citizenship: have USA; add Philippines?

I’ll defer to your expertise, since you’ve probably looked into this already, but everything I’ve found online seems to imply that it applies. Here’s the full text of the law (the previous sites I & quant18 linked to were missing some crucial lines.) In particular, see section 3:

The law doesn’t mention anything about the date of loss of citizenship, nor does the FAQ on the law from the L.A. consulate, nor does the similar FAQ from the Frankfurt Consulate.

ETA: you should contact the nearest Philippine consulate for a definitive answer, of course. That is, if you haven’t already.