From Pathfinder Gamemastery Guide, which isn't enabled.

Shiver

ITEM 3

ALCHEMICAL CONSUMABLE DRUG INGESTED POISON

Price 10 gp

Usage held in 1 hand

Bulk L

Category drug

A compound produced from the hallucinogenic venom of certain spiders, shiver is common in black markets. The addiction to shiver has the virulent trait.

Activate Interact (Ingested)

Saving Throw DC 19 Fortitude

Maximum Duration 4 hours

Stage 1 whenever you become Frightened, reduce that condition's value by 1 (10 minutes)

Stage 2 Clumsy 2 (1 hour)

Stage 3 asleep (1 hour)

Pathfinder Gamemastery GuideOGL