A) Case 1 shows marked antecollis during PRX-IR 1.5 mg, levodopa/carbidopa 300 mg, entacapone 300 mg and zonisamide 2.5 mg (left). One month after overnight switching from 1.5 mg PPX-IR to 6 mg ROP-IR (right).
B) Case 2 shows antecollis while taking PRX-IR 1.5 mg and levodopa/carbidopa 300 mg (left). Two weeks after overnight switching from 1.5 mg PPX-IR to 6 mg ROP-IR, antecollis has improved (right).