DR. J. OHAYON - ALLERGY & IMMUNOLOGY CLINIC

This website and all content Copyright 2017 of Hamilton Allergy Legal Disclaimer | Website Credits

Missed appointments and cancellations

Cancellations must be made more than 24 hours prior to the appointment time. All missed appointments are subject to a $50 charge. Unfortunately due to the high volume of patients, we are unable to accommodate missed appointments and follow-ups. Exceptions may be made with extraordinary circumstances or urgent situations determined on an individual basis. Please ask your family MD to resend a referral to our office to reschedule.

Appointment booking and wait times

Our office recognizes that waiting times for consultations are longer than we would like. We appreciate the referrals to our office and strive to satisfy our patients and their caregivers. In case of urgent referrals, our office will accommodate as best possible to see asap. We kindly ask if the referring physician call our office and we will fit in as best possible.

Prescription refills

In most cases, prescriptions are faxed to your pharmacy during your consultation for a period of 3 to 6 months, depending on the medication and condition being treated. If you have a follow-up appointment recommended by our office, further renewals will be considered then. Otherwise, we kindly ask that further refills by directed and monitored by your family physician.

Immunotherapy Injections

How much time will my appointment take?

A consultation may take up to 1 to 1.5 hours.


An oral challenge appointment to a suspected allergen will take between 3 to 4 hours.


Immunotherapy (an “allergy shot”) will take approximately 40 minutes, including a mandatory 30 minute wait time after each injection to monitor for a systemic allergic reaction.


Follow-up appointment times can vary depending on the urgency and complexity of the follow-up.


Please refer to our immunotherapy injections page under Allergy Testing/Treatments.