On the outside, the Federal Neuro-Psychiatric Hospital Yaba seems tranquil.
But on the inside of this century-old facility - one of only a half-dozen psychiatric centres in Lagos, and the only one run by the federal government of Nigeria - tensions are running high.
At the outpatient clinic, the crowd of people waiting to consult with doctors is so thick that it spills into the hallway.
The workload is so overwhelming that Dr Dapo Adegbaju, a psychiatrist rushing to attend to an agitated patient, has slept in the hospital for the past two nights.
In the emergency ward, a patient named Jide languishes in a queue where he has been waiting since 7am.
It is not yet noon at Yaba hospital, but this is business as usual. The hospital saw a 22 percent increase in the number of new patients with different types of mental illnesses in 2018 - along with a 50 percent increase in the number of patients struggling with substance abuse.
One in four Nigerians - some 50 million people - are suffering from some sort of mental illness, according to the World Health Organization (WHO).
Today - World Mental Health Day - finds the country nowhere near equipped to tackle the problem.
There are only eight neuropsychiatric hospitals in Nigeria. With dire budget and staffing shortfalls prompting doctors to go on strike, leave the country, or quit the medical profession altogether, the prognosis looks as grim for psychiatric care at Yaba hospital as it does for Nigeria's healthcare system as a whole.
Mental health crisis
The seventh-largest country in the world, Nigeria has Africa's highest rate of depression, and ranks fifth in the world in the frequency of suicide, according to WHO. There are less than 150 psychiatrists in this country of 200 million, and WHO estimates that fewer than 10 percent of mentally ill Nigerians have access to the care they need.
The stark difference between Nigeria's need for better psychiatric care - and the resources available - is illustrated by the healthcare gaps at Yaba psychiatric hospital, which had a 2018 budget of 133 million naira ($372,000) - but only 13 million naira ($36,000) or less than 10 percent of that amount released by the federal government.
As a result of financial deficits and other challenges, Yaba hospital lost 25 - roughly half of its resident psychiatrists over the past four years. Some left to find work in other countries. Some went to private hospitals. Others simply quit. The facility now has 33 resident doctors and 22 consultants scrambling to address the needs of the more than 5,000 patients that they treat every year.
Each doctor now tends to 50 to 80 patients per day - including the 535 who fill the inpatient beds, and the 100 or more emergency cases who are rushed to the hospital each week.
Yaba's psychiatric clinic, once open from 9am to 1:30pm, is now open until 5pm so its doctors can try to catch up on their backlog of patients.
Critics say Yaba's shortfalls are not only affecting the quality of its services, but the bottom lines of its patients and their families, too.
A father sitting next to his teenage daughter in the queue of patients tells Al Jazeera that he has spent 1,440 naira ($4, or half the average daily pay in Nigeria) to bring the girl in for that day's treatment. Because the journey - and the more-than-four-hour wait to see a doctor - are both so time-consuming, the exhausted-looking father has taken a full day off work - putting his family at financial risk - to give his daughter the psychiatric care that she needs.
Despite the long wait, the girl - who comes to Yaba about twice a month - will have only a short time to consult with her psychiatrist.
"A patient ought to spend between 25 and 30 minutes with the doctor, but ends up spending between four and five minutes," Yaba psychiatrist Dr. Afeez Enifeni tells Al Jazeera.
The father says he is determined to make the most of what the hospital can offer his daughter.
"Health," he insists, "is more important than anything else."