Migraine attacks progress through up to four phases, each with distinct physiological characteristics. Understanding the phases explains why early intervention with IV therapy produces better outcomes than waiting until the headache is fully established.
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Prodrome (hours to days before)Yawning, mood changes, neck stiffness, food cravings, and fatigue signal an impending attack. This is the ideal intervention window — IV magnesium administered during prodrome may prevent the full attack from developing or significantly reduce its severity.
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Aura (if present)Visual disturbances (scintillating scotoma, zigzag lines), unilateral numbness, tingling, or speech difficulty preceding the headache. Aura reflects cortical spreading depression — a wave of depolarization moving across the cortex. IV magnesium has direct membrane-stabilizing effects that interrupt this process.
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Headache phaseThrobbing, usually unilateral pain that worsens with physical activity. Nausea, vomiting, photophobia, phonophobia, and osmophobia are common accompaniments. Oral medications are frequently ineffective during established headache due to gastric stasis — the stomach stops moving food and medications are not absorbed properly.
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Postdrome ("migraine hangover")After the headache resolves, many patients experience 12–24 hours of exhaustion, cognitive dulling, and generalized unwellness. IV rehydration and nutritional support during or after the headache phase can reduce postdrome severity and duration significantly.
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Oral medication failureA critical reason IV therapy is effective for migraines: gastric stasis during attacks prevents oral medication absorption. Even if you take a triptan or NSAID at the right time, nausea and impaired GI motility may mean very little of it reaches systemic circulation. IV administration bypasses this entirely.
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Severe dehydration from vomitingMigraine-associated vomiting can produce significant fluid and electrolyte losses that perpetuate the attack. Dehydration lowers pain threshold, worsens nausea, and extends the headache phase. IV rehydration is both treatment and headache management simultaneously.
