atypical antipsychotic drug  with maximum  hyperprolactinemia is

1. olanzapine
2. clozapine
3. ziprasidone
4. resperidone

ref: GG 12e/ p 423

atypical  antipsychotics agents

• have decreased affinity for D2 receptors
• so, hyperprolactinemia adverse effect is reduced in patients
• but  risperidone and paliperidone are exceptions

• because both agents cause dose-dependent increases in prolactin

resperidone:

• Fewer side effects than Clozapine
• Blocks selective D2, NA  & 5-HT2
• Becomes "typical" at high doses leading to EPS (>6mg)
• Long acting injectable formulation
• Shares sedation, tachycardia, orthostatic hypotension and elevated prolactin
• No agranulocytosis risks
• Hyperprolactinemia

note:

among atypical antipsychotics risperidone, paliperidone have high D2 affinity  and blocks it causing Hyperprolactinemia