What are the recommended medications for the acute management of an ischemic stroke?

Acute Ischemic Stroke Medications

For eligible patients with acute ischemic stroke, intravenous alteplase (0.9 mg/kg, maximum 90 mg) should be administered as rapidly as possible within 4.5 hours of symptom onset, followed by aspirin 160-300 mg within 24-48 hours after stroke onset (or 24 hours after thrombolysis). 1

Thrombolytic Therapy

IV Alteplase - Primary Reperfusion Agent

Dosing and administration:

• 0.9 mg/kg (maximum 90 mg) over 60 minutes, with 10% given as initial bolus over 1 minute 1
• Treatment is time-dependent and should be initiated as quickly as possible 1

Time windows for eligibility:

• Within 3 hours: Recommended for all eligible patients ≥18 years, including those >80 years and those with severe stroke symptoms 1
• 3-4.5 hours: Recommended for patients ≤80 years, without both diabetes and prior stroke, NIHSS ≤25, not on oral anticoagulants, and without imaging evidence of >1/3 MCA territory involvement 1
• Extended windows with imaging selection: High-quality evidence supports treatment in wake-up strokes with DWI-FLAIR mismatch when mechanical thrombectomy is not planned 2

Blood pressure requirements:

• Pre-treatment BP must be <185/110 mmHg 1
• Maintain BP <180/105 mmHg for at least 24 hours post-treatment 1

Tenecteplase - Emerging Alternative

Tenecteplase is emerging as an alternative fibrinolytic with evidence suggesting at least equivalent efficacy to alteplase and potentially superior large vessel clot lysis 3, 4. However, the 2018 AHA/ASA guidelines predate widespread tenecteplase adoption, and the 2026 guideline update incorporates new evidence on thrombolytic choice 5.

Antiplatelet Therapy

Aspirin - Standard Antiplatelet

Aspirin 160-300 mg should be administered within 24-48 hours of stroke onset 1

• For patients receiving IV alteplase, delay aspirin for 24 hours unless compelling concurrent indications exist 1
• Rectal or nasogastric administration is appropriate for patients unable to swallow 1
• Aspirin must not substitute for alteplase or mechanical thrombectomy in eligible patients 1

Dual Antiplatelet Therapy for Minor Stroke

For minor stroke, dual antiplatelet therapy (aspirin plus clopidogrel) for 21 days started within 24 hours is beneficial for early secondary prevention up to 90 days 1

• This represents a Class IIa recommendation with Level B-R evidence 1

Agents to Avoid

• Ticagrelor is not recommended over aspirin for acute minor stroke treatment 1
• Glycoprotein IIb/IIIa antagonists (abciximab) are potentially harmful and should not be used 1
• IV tirofiban and eptifibatide have uncertain efficacy and require further trials 1

Anticoagulation

Urgent anticoagulation is not well-established for most acute ischemic stroke scenarios 1

• The usefulness of urgent anticoagulation for severe carotid stenosis ipsilateral to stroke remains uncertain 1
• Short-term anticoagulation for nonocclusive extracranial intraluminal thrombus has uncertain safety and efficacy 1

Blood Glucose Management

IV alteplase is recommended for patients with initial glucose >50 mg/dL 1

• The 2026 guideline update includes new evidence on hyperglycemia management 5

Critical Timing Considerations

Time to treatment is the strongest predictor of outcomes 1

• Every minute counts—door-to-needle time should be minimized 1
• Recent evidence demonstrates reperfusion therapies (EVT±IV thrombolysis) within 24 hours do not increase recurrent stroke or thrombotic events within 90 days 6

Common Pitfalls to Avoid

• Do not withhold alteplase in patients on antiplatelet monotherapy—this is explicitly recommended 1
• Do not use aspirin as a substitute for reperfusion therapy in eligible patients 1
• Do not administer antiplatelet therapy within 24 hours of alteplase unless exceptional circumstances exist 1
• Do not exceed BP thresholds before or after thrombolysis—this increases hemorrhage risk 1, 7