1. Inability to refrain from use of non-steroidal anti-inflammatory drugs (NSAIDs), aspirin or any potential anticoagulant/antiplatelet medication, such as dipyridamole (Persantine), clopidogrel (Plavix), dabigatran (Pradaxa), or warfarin (Coumadin) for at least 72 hours prior to invasive procedures (lumbar puncture [LP], lumbar drain). Aspirin must be held for 7 days.