The dosing recommendation for Shingrix is as follows:
- Healthy adults 50 years and older should get two doses of Shingrix, 2 to 6 months apart.
In regard to the second dose, there is no "ideal" month during the two to six month time frame. According to the prescribing information for Shingrix, there is no significant difference in efficacy or adverse effects, regardless of the month the second dose is given (as long as it is 2 to 6 months after the first dose):
"The safety profile of SHINGRIX was similar when administered according to a 0- and 2-month or 0- and 6-month schedule."
You can feel comfortable getting your second dose anytime during the 2-6 month window.