Scots over the age of 40 whose second covid vaccine dose is more than eight weeks after their first are being encouraged to seek an earlier slot.
The NHS Inform website has launched a new online tool which allows people to check the status of their second appointment.
Recent advice has recommended bringing forward the second dose from 12 to eight weeks.
Those who have an invitation for a second dose with a 12-week interval will now be able to bring this forward.
The Scottish Government says under-40s will also be able to reschedule their second doses when supplies permit.
As well as the "vaccine journey" tool on the NHS Inform website, the national helpline can be used to reschedule second doses.
Health Secretary Humza Yousaf said: "We are working closely with NHS boards to ensure the number of appointments can be increased in line with national guidance to help combat new variants and provide protection to as many people as possible.
"Boards are boosting their capacity to administer second doses alongside the delivery of first doses to younger cohorts and appointments are now being issued in accordance with the new recommendation of an eight-week gap.
"The second dose is vital in providing greater and longer lasting protection against the virus - particularly the new Delta (Indian) variant.
"In line with the advice from the JCVI, we encourage those whose appointment was already scheduled - which is mainly over-40s at this time - to use the NHS Inform online tool, drop-in clinics or the national helpline to get their second dose appointment as close to eight weeks after their first as possible."
Earlier this week Yousaf wrote to UK Health Secretary Matt Hancock about "tight" supplies of the Pfizer covid jab which is being under for under 40s across the country.
On Friday, Vaccines Minister Nadhim Zahawi attempted to calm fears by saying that supplies were tight but "stable".
He said: "I am absolutely confident, and I'll speak to Humza on this, that we will be able to deliver the Pfizer vaccines that Scotland needs to be able to meet its targets for end of July, as the United Kingdom target."
Asked if it is going to be "tight" in the next few weeks, he said: "It will be, there is no doubt. Every time I've come on your show I've said that the determining factor in terms of vaccine in arms is supply.
"And supply remains finite, but it is stable, and Pfizer have done a great job in being consistent on their delivery schedule."
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