AMA Manual of Style - Stacy L. Christiansen, Cheryl Iverson 2020
Capitalization After a Greek Letter
In titles, subtitles (except in references), headings, and at the beginning of sentences, the first non-Greek letter after a lowercase Greek letter should be capitalized.
β-Blockers help control heart rate and are also used in the treatment of abnormal heart rhythms.
Do not capitalize the Greek letter, unless the word normally includes a Greek capital letter. In that case, the first non-Greek letter after the capital Greek letter should be lowercase.
Β-Hemolytic streptococci are bacteria that can destroy red blood cells and cause a variety of diseases.
Δ-9-tetrahydrocannabinol administered intravenously to marijuana smokers disappeared from the blood plasma with a half-life of 28 hours compared with 57 hours for nonusers of marijuana.
For hyphenation in words that contain Greek letters, consult 184.108.40.206, Hyphen, Special Combinations.