There are two ways to implement continuous dosing:
1) Use a repeat or scheduled dose with just one dose starting at t=0. You can set the 'rate' parameter to the rate you need and set the 'amount' parameter to a large number. This way, the total amount will never be reached and the dose is given continuously. Your 'amount' should be larger than 'rate*(duration of simulation)'
2) Instead of a dose object you can introduce a reaction “null -> species” reaction with a rate parameter k and mass action kinetics. This describes a continuous synthesis or dosing of “species”.
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