felt a little weird; feeling foggy; couldn't walk/felt like a drunken sailor, that's how bad the walking and gait pattern were; couldn't do any of his work, couldn't take phone calls; couldn't concentrate; This is a spontaneous report from a contactable consumer (Patient). A 68-year-old male patient received BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Formulation: Solution for injection, Lot number: EW0182, Expiration Date: not reported) via an unspecified route of administration in upper left arm on 17May2021 09:30 (at the age of 68-year-old)  as 1st dose, single dose for COVID-19 immunization. Patient did not received any other vaccinations within four weeks prior to the first dose. The patient had no history of all previous immunization with the Pfizer vaccine considered as suspect and was not administered with additional vaccines on same date. Medical history included ongoing spinal stenosis diagnosed 5 years ago. Concomitant medication(s) included codeine phosphate, paracetamol (TYLENOL WITH CODEINE) taken for spinal stenosis. The patient experienced feeling foggy, couldn't walk/felt like a drunken sailor, that's how bad the walking and gait pattern were, couldn't do any of his work, couldn't take phone calls, couldn't concentrate on 31May2021, 2 weeks after first shot and felt a little weird on an unspecified date. AE(s) did not required a visit to emergency room or physician office. The patient underwent lab tests and procedures which included magnetic resonance imaging: spinal stenosis on an unspecified date diagnosed 5 years ago. It was reported, according to the MRI 5 years ago, had supposedly been suffering for over 30 years and they just discovered it 5 years ago. It was reported that, his second dose was scheduled this coming Monday, 07Jun2021. He stated the first 2 weeks between 17May2021 and 31May2021, he was fine and had no side effects, not even a pain at the injection site in his left arm, until 31 May. He suddenly started feeling foggy, couldn't walk- he was walking "like a drunken sailor", couldn't do any of his work, couldn't take phone calls, and couldn't concentrate. He was getting a little better- still had a little trouble walking and still feeling a little foggy. He have spinal stenosis and wasn't sure if that had anything to do with it but said the nurse he spoke to before said she didn't think it had anything to do with it. He wanted to know if anyone else reported that. He also had concerned about the two week delay in side effects. He stated his 29 year old son took the vaccine the same day and had no reaction what so ever. He did not said if his son had concerned about efficacy because of that or not. Patient enquired if he should go ahead and take the second dose. Patient stated at the moment, he didn't had a primary care doctor and he hadn't been to a doctor in over 5 years. He suffered or had debilitating condition, spinal stenosis and he never discussed it by the nurse and it didn't come up on the questionnaire. He still had a problem walking, he can't walk a straight line, it was very strange. He improved slightly, it was all terrible on Monday, he was like a drunken sailor, that's how bad the walking and gait pattern were and he had gotten a little bit better, but it was still a problem. Patient was curious and have concerned about his second dose as he has heard stories from people that the side effects are worse. His concern was as he got a reaction to the first shot, he going to experience on his second shot. The outcome of the event felt a little weird was unknown and for rest of the events it was resolving.