It's important to note that legal tender is not possible in Panama as the constitution doesn't allow such status to any specific currency. In Panama we use the dollar (due to heavy American influence and economic stability) as our main currency but that doesn't mean it is legal tender. Bitcoin will now be, in theory, in the same situation as the dollar. This law will not force any party to use anything unless they want to. Therefore, the adoption dynamics are going to be fully (in theory) dictated by the market.
By express mandate of the Law, it is the obligation of every business, including banks, to accept US paper currency in all denominations.
In this regard, Article 1171 of the Fiscal Code establishes that:
Article 1171: The currency of the Republic of Panama will be the Balboa, which is a gold coin with a weight of nine hundred eighty-seven and a half milligrams (0.9875) and a purity of eight hundred twenty-nine thousandths (0.829), divided into one hundred hundredths (100/100).
The current United States Dollar and its multiples and fractions shall be legal tender in the Republic of Panama, with a face value equivalent to the respective Panamanian currency."