"The following information on dosage is based on my own experiences and on an analysis of 176 experience reports posted on-line at Erowid.org.
THRESHOLD (3-5 grams or 1-1.5 tsp) A threshold dose of nutmeg is marked by euphoria, relaxation, mood elevation, hilarity and enhancement of the senses. Baseline is around hour eighteen. Some people will not experience effects at this level.
LOW--MODERATE (6-10 grams or 1.5-3 tsp) A low-moderate dose of nutmeg will produce a more distinct effect than a threshold dose, and may cause visual distortions, closed-eye visuals, and auditory hallucinations. Short-term memory may become impaired and speech may become slightly slurred during the peak of a low-moderate dose.
MODERATE (11-15 grams or 1-1.5 Tbsp) A moderate dose of nutmeg can cause slurred speech, disorientation, and loss of coordination. Previously stated effects increase and the user may experience mild visual phenomenon.
MODERATE-HIGH (16-20 grams or 1.5-2 Tbsp) A moderate-high dose may produce a waking dream-like state. One individual sought emergency room services after ingesting 15-20 grams of nutmeg. The user reported experiencing trouble breathing, blackouts, delusions, and panic (Marquis 2006).
HIGH (20-25 grams or 2-2.5 Tbsp) A high dose may increase the perception of being in a dream world. Users may begin experiencing stomach pain"
(Nagano I. "Myristica fragrans: An Exploration of the Narcotic Spice". T, 2009)