- constant rather than episodic trouble breathing, persistent pain or pressure in the chest, new confusion, inability to wake or stay awake, bluish lips or face, or any other severe symptom [symptoms cdc urges immediate medical care for]. - known sensitivity or intolerance to famotidine or another acid-blocking drug. - lack of access to the internet at home. - using tizanidine (zanaflex® , a muscle relaxant), dasatinib (sprycel®, a drug for leukemia), cefditoren (pivoxil®, an antibiotic), or fosamprenavir or delavirdine (drugs for hiv) [drug exclusions are per us label for pepcid]. - significant heart or kidney disease in the last 3 months according to subject's primary doctor - pregnant women - taking any investigational medications to treat covid-19, famotidine, anti-viral drugs or corticosteroids and not stopping them within 48 hours before starting study treatment. note: patients are allowed to take over-the-counter agents for temporary relief of symptoms such as antipyretics and analgesics (aspirin, ibuprofen etc), cough remedies, anti-diarrheals, etc.

- constant rather than episodic trouble breathing, persistent pain or pressure in the chest, new confusion, inability to wake or stay awake, bluish lips or face, or any other severe symptom [symptoms cdc urges immediate medical care for]. - known sensitivity or intolerance to famotidine or another acid-blocking drug. - lack of access to the internet at home. - using tizanidine (zanaflex® , a muscle relaxant), dasatinib (sprycel®, a drug for leukemia), cefditoren (pivoxil®, an antibiotic), or fosamprenavir or delavirdine (drugs for hiv) [drug exclusions are per us label for pepcid]. - significant heart or kidney disease in the last 3 months according to subject's primary doctor - pregnant women - taking any investigational medications to treat covid-19, famotidine, anti-viral drugs or corticosteroids and not stopping them within 48 hours before starting study treatment. note: patients are allowed to take over-the-counter agents for temporary relief of symptoms such as antipyretics and analgesics (aspirin, ibuprofen etc), cough remedies, anti-diarrheals, etc.

1. - constant rather than episodic trouble breathing, persistent pain or pressure in the chest, new confusion, inability to wake or stay awake, bluish lips or face, or any other severe symptom [symptoms cdc urges immediate medical care for]. 2. - known sensitivity or intolerance to famotidine or another acid-blocking drug. 3. - lack of access to the internet at home. 4. - using tizanidine (zanaflex® , a muscle relaxant), dasatinib (sprycel®, a drug for leukemia), cefditoren (pivoxil®, an antibiotic), or fosamprenavir or delavirdine (drugs for hiv) [drug exclusions are per us label for pepcid]. 5. - significant heart or kidney disease in the last 3 months according to subject's primary doctor 6. - pregnant women 7. - taking any investigational medications to treat covid-19, famotidine, anti-viral drugs or corticosteroids and not stopping them within 48 hours before starting study treatment. note: patients are allowed to take over-the-counter agents for temporary relief of symptoms such as antipyretics and analgesics (aspirin, ibuprofen etc), cough remedies, anti-diarrheals, etc.

1. - constant rather than episodic trouble breathing, persistent pain or pressure in the chest, new confusion, inability to wake or stay awake, bluish lips or face, or any other severe symptom [symptoms cdc urges immediate medical care for]. 2. - known sensitivity or intolerance to famotidine or another acid-blocking drug. 3. - lack of access to the internet at home. 4. - using tizanidine (zanaflex® , a muscle relaxant), dasatinib (sprycel®, a drug for leukemia), cefditoren (pivoxil®, an antibiotic), or fosamprenavir or delavirdine (drugs for hiv) [drug exclusions are per us label for pepcid]. 5. - significant heart or kidney disease in the last 3 months according to subject's primary doctor 6. - pregnant women 7. - taking any investigational medications to treat covid-19, famotidine, anti-viral drugs or corticosteroids and not stopping them within 48 hours before starting study treatment. note: patients are allowed to take over-the-counter agents for temporary relief of symptoms such as antipyretics and analgesics (aspirin, ibuprofen etc), cough remedies, anti-diarrheals, etc.

1. - constant rather than episodic trouble breathing, persistent pain or pressure in the chest, new confusion, inability to wake or stay awake, bluish lips or face, or any other severe symptom [symptoms cdc urges immediate medical care for]. 2. - known sensitivity or intolerance to famotidine or to ascorbic acid. 3. - lack of access to the internet at home. 4. - using tizanidine (zanaflex® , a muscle relaxant), dasatinib (sprycel®, a drug for leukemia), cefditoren (pivoxil®, an antibiotic), or fosamprenavir or delavirdine (drugs for hiv) [drug exclusions are per us label for pepcid]. 5. -taking any medications to treat covid-19, except for over-the-counter agents for temporary relief of symptoms such as antipyretics and analgesics (aspirin, ibuprofen etc), cough remedies, anti-diarrheals, etc.

1. - constant rather than episodic trouble breathing, persistent pain or pressure in the chest, new confusion, inability to wake or stay awake, bluish lips or face, or any other severe symptom [symptoms cdc urges immediate medical care for]. 2. - known sensitivity or intolerance to famotidine or to ascorbic acid. 3. - lack of access to the internet at home. 4. - using tizanidine (zanaflex® , a muscle relaxant), dasatinib (sprycel®, a drug for leukemia), cefditoren (pivoxil®, an antibiotic), or fosamprenavir or delavirdine (drugs for hiv) [drug exclusions are per us label for pepcid]. 5. -taking any medications to treat covid-19, except for over-the-counter agents for temporary relief of symptoms such as antipyretics and analgesics (aspirin, ibuprofen etc), cough remedies, anti-diarrheals, etc.