Most patients benefit from using a different site each week, creating a simple rotation pattern they can follow month after month
Sources & Further Reading MHRA (UK) Yellow Card scheme: Report or check suspected side effects of any medicine, including Ozempic, with the UKs drug-safety regulator

When to call your provider Within 24-48 hours: Positional headache not improving after 7 days of structured hydration Headache interfering with work or daily activities more than 3 days per week New headache pattern after several months on a stable dose Headache requiring daily analgesic use Same day: Headache with visual changes (blurring, double vision, blind spots) Headache with persistent vomiting Headache with confusion or difficulty concentrating beyond what's normal for you Headache that wakes you from sleep repeatedly Emergency care: Sudden severe headache reaching peak intensity within 1 minute Headache with fever and stiff neck Headache with weakness, numbness, or difficulty speaking Headache with seizure Headache after head trauma "Worst headache of my life" The threshold for imaging in GLP-1 patients with headaches is lower than in the general population because of rare but documented cases of idiopathic intracranial hypertension associated with rapid weight loss

However, maintaining consistent levels in the body may support long-term effectiveness
Liakos CI, Papadopoulos DP, Sanidas EA, Markou MI, Hatziagelaki EE, Grassos CA, et al