Seizure; This is a spontaneous report from a contactable consumer (Patient). A 38-year-old male patient received second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, Batch/Lot Number: FC3180), via an unspecified route of administration, administered in left arm on 04Aug2021 at 17:19 (at the age of 38-year-old) as a single for COVID-19 immunisation. Medical history included sleep apnoea syndrome from an unknown date and unknown if ongoing: Sleep apnea, seizure from an unknown date and unknown if ongoing: Hay fever, seasonal allergy from an unknown date and unknown if ongoing: Seasonal allergy, attention deficit hyperactivity disorder from an unknown date and unknown if ongoing. No investigation assessment was reported. No relevant family medical history to adverse event was reported. Concomitant medications included fexofenadine hydrochloride (ALLEGRA) taken for seasonal allergy, start and stop date were not reported; colecalciferol (D3) taken for an unspecified indication, start and stop date were not reported; fish oil taken for an unspecified indication, start and stop date were not reported; zinc taken for an unspecified indication, start and stop date were not reported; escitalopram oxalate (LEXAPRO) taken for obsessive compulsive disorder (OCD), start and stop date were not reported (taking for probably about 2 years); amfetamine aspartate, amfetamine sulfate, dexamfetamine saccharate, dexamfetamine sulfate (ADDERALL XR) taken for attention deficit hyperactivity disorder, start and stop date were not reported, Multivitamin taken for an unspecified indication, start and stop date were not reported. Historical vaccine given to patient previously was bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, Batch/Lot Number: EW0191), first dose via an unspecified route of administration, administered in left arm on 22Jun2021 (at the age of 38-year-old) as a single for COVID-19 immunisation. The patient did not receive any other vaccines within 4 weeks prior to the COVID vaccine. No additional vaccines administered on same date of the Pfizer suspect. No relevant tests were performed. Report was not related to a study or programme. No adverse event following prior vaccinations. On 18Aug2021 at 02:00, the patient experienced seizure. Adverse events required a not visit to emergency room and visit to physician office, he did go to the neurologist office and saw the Nurse Practitioner, He is who ordered the lab tests and the EKG. When he goes back, he was not very impressed with him. When he goes back, he wants to see the neurologist in that practice. It was reported that caller states he was calling regarding the Pfizer Covid-19 vaccination. He got the second vaccine earlier this month, he thinks 04Aug2021. He got both of the vaccines at a local, both of the Pfizer vaccines. The reason he was calling is that 2 weeks after he got the vaccine, pretty much to the day of getting the vaccine, he had a seizure. He has had seizures before but, he has not had one in 3 years. It was going on pretty good and did not have any problems with seizures until then. It was right, 2 weeks after the second dose he had the seizure. Right now, he was trying to get in with the neurologist. He saw his nurse practitioner the other day and he was trying to see the actual neurologist. It was kind of hard to get in with the neurologist. They usually have 6 months to a year waiting period. Caller provided the name of the neurologist but stated that he was unsure of the spelling. He was still trying to talk to him. The other day, he talked to the nurse practitioner and he was not trying to mean but he does not think he knew a lot about certain things. He was talking to him about some seizure laws and the caller looked at it and stated that some of it was just wrong. He thinks he was trying to get in with the actual doctor. He knows it was really hard to get in really fast. It was early in the morning Wednesday, last week, 18Aug2021. It was like Tuesday night into Wednesday morning, clarifies it was at like at 02:00 in the morning Wednesday. It was pretty bad. His wife has a video of it. His wife took a video of it. That was the thing that got him. He had taken his medicine and was wearing his continuous positive airway pressure (CPAP) machine. He had never had one when he had done everything. He usually never had one. His wife had been there for all of them and said that he has not had one in 3 years. And before that, it was a couple of years before that. This one was the worst of all, his wife thought, that he ever had. he never had one before when he was actually wearing his CPAP mask. He was waking medicine the way he was supposed to. He cannot remember having one when he was doing everything he was supposed to be doing. His wife said it lasted longer. She said his seizure lasted a little over 10 minutes. It was usually between 5 and 7 minutes. She was worried that it went a little past 10 minutes. She called 911 and they sent an Emergency medical technician (EMT) out. He does not even remember half of the stuff that happened. When he woke up, he remembered the EMT above him. He was very incoherent. His wife said he ended up on her side of the bed. She said that he got up and was wobbling around to her side of the bed. He does not remember any of that. He did not go to the hospital. When the EMT came, they asked some questions and waited until he got lucid. They had asked him who the president was, and he said (PRIVACY). They told him to think a little harder. It took him a little while, then eventually he came back around. They stayed until he kind of got lucid again. He had asked them where his wallet was, and he had no idea where it was. Simple things, he could not remember. Eventually, he came back, and they were like ok. He was then in the right state of mind. After that happened, they said they could take him to the hospital emergency room, but the emergency room was backed up with COVID and if they were to take him to the hospital, he would get exposed to COVID. The Emergency Room (ER) was full so, he said he would wait until he had an appointment with the neurologist. They did not think he was in any danger at that point. He does take generic of Keppra, 2,000 milligram (mg) extended release. He takes it at night before bed. He had been taking it for probably 2 and a half years. They switched him to that about 2 and a half years ago from regular Keppra. They said the extended release might help his sleeping habits. They said Keppra can make you maybe drowsy, so they said taking it at night would be better. So, they switched it to extended release. Provided the name of the generic medicine, Levetiracetam ER. They only make it in 500 mg tablets, so he has to take four 500 mg tablets to equal 2000 mg total. It was an anti-convulsion medicine. He does have sleep apnea. They suspected he stopped breathing at night because of sleep apnea, which may cause him to have seizures. He was wearing his CPAP when it happened. They even pulled it up when he did go to sleep. The Nurse Practitioner pulled it up, his CPAP. It has smart chip in it and monitors while he is asleep. They pulled it up and he did not really have any stoppage of breathing or any major incidences that might have caused him to have a seizure or would have stopped breathing. He knows it sounds silly now, but he has a medical history with seizures in the past. He thought that he did not want to get sick or get COVID or have something like that. He thought that if he were to get COVID, and could not breathe, he might have seizures. That was the whole reason for getting it was to avoid getting seizures. Then, he turns around and got the seizure. All of this he was thinking of trying to do all this to help with COVID. He thought, especially around the shot, he would build up his immunity too. Has hay fever and seasonal allergies but nothing too bad. He knows one of the worst things about having seizures was that he cannot drive for 6 months. He was a little bit bummed out because he thought he was doing something good when he got the shot. If he did get too sick with COVID, it could cause him to have one of these episodes, or seizures. He thought he was doing a good thing then it turned back around and bit him. He does not know. Everybody told him he should report this because it did happen within 2 weeks of getting the second dose. He does not know if he can be sure of anything. His wife was dead certain that it what it was. Thinks there may be a strong chance, does not now if 100 percent. He does not know what else in his life has changed. He was wondering because, he was not going to be able to drive for 6 months, he works with his dad. He was not sure if there was any kind of relief he could apply for. He was not even 100 percent sure that was what caused it. His wife was pretty sure that was what caused it. He has a very strong suspicion and so does his mother. They just did his blood work, and they are supposed to get the results back sometime early next week. He is supposed to have an Electrocardiogram (EKG) next week and they may know more information down the road. He will possibly have a Magnetic Resonance Imaging (MRI) but was not sure if they are going to do it yet or not. he has not had one in 3 years. The only thing was MRIs are not cheap. Even out of the pocket was a thousand dollars. He was debating on doing that. Does not have many occasions of epilepsy or anything like that in his family. He was the only one who really has seizures or anything like that. There are stroke and heart conditions. His grandparents, he thinks. He was the only one with any kind of issue with seizures. For the most part, what gets him the most is that his biggest concern was to get vaccinated. He thought if he got it and got really sick, and could not breathe, it would cause him to have a seizure. That was his primary reason for getting the vaccine. He was thinking, his wife does not like the idea of vaccinating. But he has deeper medical issues. If he does get sick, he could have a seizure and that is what justified it. Now, she was convinced, that was what caused it. She has a PhD. They did not know if it was or not. They have no way to prove it was or was not. Therapeutic measures were taken as a result of seizure (seizure). The patient underwent lab tests and procedures which included blood test: unknown on an unspecified date in 2021 Blood work. The outcome of the event was reported as unknown.  Follow-up attempts are completed. No further information is expected.