LENFERA is generally safe to use, but possible side effects include stuffy or runny nose, headaches, goosebumps, hiccups, cramps, sensitivity to bright lights or glare, shingles, gingivitis, numbness of lips or upper palate, dry scalp, ringing in the ears (tinnitus), acid reflux, dizziness, hair loss, hearing loss, kidney stones, constipation and/or diarrhea, sudden loss or gain…

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