Unless otherwise instructed, gabapentin should be used in addition to your existing medications. Gabapentin is begun at a low dosage and progressively raised to reduce adverse effects. Gabapentin (gabantin 300mg) should be taken as suggested in the table. If a lesser dosage totally relieves your pain, you may continue on that dose rather than moving to the next. Gabapentin (gabantin 100mg) may cause life-threatening breathing issues, particularly if you already have a respiratory disease or are taking other medications that make you sleepy or slow your breathing. If your breathing is extremely sluggish, get immediate medical help.