Glasgow City Council has sent letters to those affected to inform them that their care will be withdrawn for two days this week, since around 8,000 workers retire in a row of equal pay.
The letter says: "The strike is definitely taking place and, unfortunately, we have not been able to ensure sufficient home care personnel to provide the coverage we expected."
Ask the recipients to make arrangements with relatives, caregivers or friends if possible, apologize for the interruption and warn that there will be no response to calls or emails during the strike, which will take place tomorrow and Wednesday.
The family of a woman who received the letter said that they fear that they will put their lives at risk, since people can not access the medicines.
Amy Coid, 90, has just left the hospital and normally receives four daily care visits. She is blind in one eye and suffers slight confusion, so she receives meals and helps to get dressed.
You are not allowed to deal with your own medication. It is kept in a closed box to which only caregivers have access. Your family wants to be given the code of the box to give you the 14 tablets you need per day.
One relative said: "It seems that the lives of many older people will be put at risk as they will not receive their medications.
"We are fortunate and we will be able to make two 30-mile trips each day to give him his medicine in the morning and in the evening, but how will confused elderly people with no relatives, neighbors or friends manage? Some will take medications without which they could getting sick or getting worse Some may not understand the letter or be unable to do anything about it. "
A spokesman for Glasgow City Council said the way the union leaders had approached the strike was "enormously disappointing."
He said: "We thought we had an agreement to provide life and limb coverage to our most vulnerable citizens; in fact, unions told the public that coverage would be in place. It will not.
"There has been no significant effort on the part of the unions to work with us to ensure that life and limb coverage are in place."
The GMB stated that the unions have accepted the council's requests to support the life and limb plan.
Scotland's organizer, Rhea Wolfson, said its members would never do anything to harm home care clients.
He added: "Glasgow City Council has misrepresented the offer our members have made to keep services running for our most vulnerable clients. Board officers have been unable to establish the most basic coverage despite having three weeks to prepare. "
Home care services for around 6,000 people will be affected.